Apply incident rate formula to identify trends in incident severity and frequency. $endgroup$ – user57037. How to Calculate a Hit Ratio. Lost time injury frequency rates’ (LTIFR) are used to calculate how a company health and safety system is performing, by calculating the number of LTIs multiplied by 1 million, divided by the number of person-hours worked in the period. 2 in GRI 101 for requirements on reasons for omission. The observational patients had an mortality incidence rate of 12. For instance, if you had two cases where an employee missed work from a workplace accident, your DART would also be 2. The accident rate gives an estimate of the accident risk per flight. It is also occasionally referred to as temporal frequency for clarity and to distinguish it from spatial frequency. The inclusion criteria for the current review were as follows: (1) articles with near-miss incidence or prevalence data, (2) published between January 2004 and December 2010, (3) included data from 1990 onwards, (4) sample size ≥200 and (5) clearly described methodology. During the study period, a total of 8,433 live births were recorded across the three study centers, while a total of 288 women were identified to be maternal near-miss (Table 1), yielding an overall maternal near-miss incidence of 3. This would be a pretty high TRIFR, as you can see some TRIFR averages here. Logistic regression was conducted to calculate crude and adjusted odds ratios (ORs) and 95% CIs. 1 * (0. TRIR = 6 x 200,000 / 500,000. Within the work book there is two types of sheets one with Leading Indicators Under the Monthly Stats Tab, The other is under the current Stats Tab. 80% to 8. This paper reports on the first national cycling ‘near miss’ research, providing an in-depth window into frequency and experiences. Low Incidence of Maternal Near-Miss in Zhejiang, a Developed Chinese Province: A Cross-Sectional Study Using the WHO Approach. NSHINR. 503–0. According to one definition, a near miss is an occurrence with potentially important safety-related effects which, in the end, was prevented from developing into actual consequences (Van der Schaaf, 1992). ethods One year of retrospective data from 2017 were collected from one patient cohort in a 422-bed acute care hospital. Once reported, an investigation of the incident. 32 IF-EU-320a. Near-miss rates identified by management-specific criteria. 9 %. Importance. Near Miss Frequency Rate (NMFR) This KPI measures the number of near-miss incidents per million hours worked. iv. ,. Thus Near Miss Ratio (NMR) and Maternal Mortality Ratio (MMR) of our hospital is 52. Using this standardized base rate, any company can calculate their rate(s) and get a percentage per 100 employees. 9 per 1000 live births and a mortality index of 1. 8 million workers were suffering from an illness they believed was caused or made worse by their work and 565,000 workers sustained a non-fatal injury at work. 5 million hours for the year and has experienced 20 recordable level injuries which gives them an incident rate of 1. Haemorrhage was found to be the most common cause. In medicine, the incidence is commonly the newly identified cases of a disease or condition per population at risk over a specified timeframe. LOST TIME CASE RATE. 3. Basic Epidemiological Methods and Calculations. You can use the definitions below as reference to help you determine whether an event is a near accident: Near miss: This is an event that almost results in collateral damage. 07, lower index indicative of. See clause 3. S. S. Using these documents, simply plug in the number of recordable injuries and illnesses with total hours worked to find your OSHA incident rate. These two types of events should be collected as independent or. That is obviously unrealistic, especially for big companies with many employees. S. The session aims to develop the knowledge and skill of safety officers in calculating FR and SR which is part of the report being submitted to DOLE, in compliance with DO198-18. 23% in studies which use different criteria . The resulting calculation would be: (5 recorded 'injuries' x 1,000,000) / 200,000 hours = 25 injuries per million hours worked. Therefore, he established a link between the number of near misses and the number of significant casualties. 81 4. The incidence rate of near miss over an uninterrupted six month period was 12% (42 near misses out. Near-miss management system is an umbrella term used to refer to software systems used to record, analyse and track near misses (Oktem 2002 ). From a hospital based study that used a modification of the WHO tool , the maternal mortality ratio was 350 maternal deaths per 100,000 live births, the maternal near miss incidence ratio was 23. AIFR = (Reported injuries x 200,000) / Employee total hours worked. Identify the number of new cases. 2. The number of reported accidents is derived from your operations, as is the total hours worked, while the number 200,000 is used in a number of safety KPI's to standardise the AFR. 54; 2. This number is used by insurance companies to set and adjust insurance rates and workers compensation plans. Get Catalog | Get Free Samples. 2 maternal near misses per 1000 live births (95% CI: 30. Write down the number of new cases found in the period of time you're considering. ([Number of lost time injuries in the reporting period] x 1,000,000) / (Total hours worked in the reporting period) RIFR: Reportable Injury Frequency RateIf you need help calculating your company's OSHA TRIR rate, please call (720) 547-5102. 1). Number of Disabling Injuries refers to. Near miss reporting is a vital component of process safety management (PSM), which aims to prevent major incidents and losses in hazardous industries. This paper discusses findings from a project exploring experiences of cycling near misses. The number of HPIs reported in 2020/21 was 25. Accident: This is a workplace event that causes serious injuries. Frequency Rate: 144. if you want RIDDOR AFR only use RIDDOR number of accidents and formula is the same. 1% to 418. Step 4 – Develop an Action Plan. Then use the tool below to calculate your company’s rate. Near Miss: Minor LOPCs or System failures which could have led to an incident. 2 (95% CI, 100. The reason for calculating an accident frequency rate is to. Please review the table's key for any confusion regarding the formulas. 48 dis-abling injuries per million employee hours of exposure. Rolling Injury Frequency Rate Excluding Parking Services (per 1,000,000 Hours Worked) 4 4 2 2 18 18 20 20 16 16 14 14 12 12 10 10 8 8 6 6. For example, if all your employees during last year worked for a total number of hours equal to 2,000,000, and your number of recordable injuries is 2: TRIR = (2 × 200000) / 2000000 = 400000 / 2000000 = 0. 011% between 2007. Formula: Effectiveness = (Number of Accidents Before Safety Program) - (Number of Accidents After Safety Program) / (Number of Accidents Before Safety. To calculate accident frequency rates for injuries, near-miss incidents, and property damage accid ents, you need to . DART. Data includes incidents and hours from all locations except Near Miss Frequency Rate (NMFR) is limited to fixed operational facilities. A single injury or illness has a much greater effect on incidence rates in small establishments than on larger establishments. 0% and with the overall ratio. The output of this all injury frequency rate calculation is your AIFR 'score' and indicates how many injuries are suffered when standardised across 100 employee working 40 hours per week for one year. TRIR is equivalent to MSHA All-Incidence Rate (AIR). Without these. 8 years. After 100 required trials, participants could choose to keep playing for a chance to earn a cash prize for the highest score among a pool of participants. Frequency (symbol f), measured in hertz (symbol: Hz), is the number of occurrences of a repeating event per unit of time. Divide the result by 2π to find the natural frequency:assessor variance and calculating the intraclass correlation. 944. 008 Near Miss Frequency Rate (NMFR)5 Full-time Employees 3. Occupational Safety and Health Administration defines incidence rate as the number of injuries/illnesses × 200000/employee-hours worked, where 200000 represents the equivalent of 100 employees working for. 000 jam dan absen 60. 99% in studies which had management-based criteria. Calculation of injury frequency rates While HSE calculates injury INCIDENCE RATES per 100 000 employees, some parts of industry prefer to calculate injury FREQUENCY RATES, usually per million hours worked. 7 to 4. This guide helps business leaders obtain the information . Creating a culture of proactive reporting. Make the reporting system easy to understand and use. Results We enrolled 220 participants (55 maternal near misses and 165 non-near misses) with a mean age of 27 ± 5. (1) Total Recordable Injury Rate 0. 95 2. We can. Near misses are regarded as being on the same continuum as adverse events in terms of failure factors but differing in terms of the additional information they provide on recovery factors and in their significantly. The first step in benchmarking is to calculate the incidence rates for your organization. 2%) were minor injuries. Location B with its 250 employees has worked 512,500 hours for the year and has experienced 6 recordable level injuries which gives them an incident rate of 2. The reason for calculating an accident frequency rate is to. The subjects of the two groups who played on did not differ in the number of trials they then completed although they con- tinued to experience different rates of occurrence of near misses. 34. The U. The near miss reporting procedure should form part of the company’s overall safety program and should be communicated at all levels, through regular safety training. 2. 80% to 8. 004 0. Total Recordable Case Frequency (TRCF) Calculator » Find more HSE jobs, documents. 8:1. 24im trying to set incident frequency rates targets and near miss frequency rate targets for both construction and manufacturing , i have RIDDOR frequency rates , could amy members out ther share any company or set IFR and AFRs = thats for support and help. 9:1, and the mortality index was 0. The formula for calculating your accident frequency rate is the number of reported accidents multiplied by 200,000, divided by the number of employee hours worked. An employee who witnesses a near miss incident must complete the Near Miss Reporting form (located in the main office) and submit to a Manager or Human Resources. Sample data collection form 21 Annex 3. 7. Suppose you had three recordable incidents during the year. 3. The rates of maternal near-miss will be calculated for each collaborating center using the WHO maternal near miss approach , and frequencies of non-near-miss severe maternal morbidity will be calculated using specific defined diagnoses. HSE Rate Formula IndexLost Time Injury Frequency Rate (LTIFR). It can be the total amount of reported cases or similar frequency rate as TRIF but it measures the frequency of reported near misses or safety observations. Researchers coded the reports using a qualitative 5 × 5 risk matrix. 4 lost time injuries for every one million man hours worked. The pooled global near-miss estimate was 1. 47 1. 99. Result: 2 * 1,000,000 / 111,200 = 17. (e. The easy part of TRIFR calculations, like all safety KPIs ( see more here) is the measurement itself. comparable across any industry or group. Total Case Incident Rate (OSHA Recordable Incident Rate) TCIR. (e. MTI is Medical Treatment Injury (a work-related injury that requires treatment by a medical practitioner beyond first aid). This method, by counting hours worked rather than the number of employees, avoids distortions which may be. TRIR presented here may differ from reported TRIR in FCX'sDOWNLOAD HERE: Copy of Data statistics draftV1. Incident: This is a workplace event that causes mild to moderate injuries. OSHA. This may in-The second figure in the calculation, 200,000, reflects the amount of hours that 100 employees working 40 hours per week would clock over the course of a year. 6- to 8-fold higher than the neonatal mortality rate (13, 14, 17). Electric utilities standard1 (continued) SASB Code Accounting metric 2018 End use efficiency & demand IF-EU-420a. Of those, 167 were valid near misses that occurred at work. Calculating individual rates, and then taking the mean of these, provides a different and higher rate: . To calculate a hit ratio, divide the number of cache hits with the sum of the number of cache hits, and the number of cache misses. Reporting a medication near-miss is crucial, as it highlights areas of human and system failures. Ratio of Near Miss to Injury/Illness Incidents ((Total # of Near Misses) / (Total Number of Injury / Illness Incidents)) Injury Experience Analysis {([Total Other Recordables * 1] + [Total Restricted Duty Cases * 2] + [Total Lost Time Cases * 5]) * 200,000} / Total Hours Worked: Frequency Severity Index To calculate your LTIFR, simply plug those numbers into your formula: (6 x 1,000,000) / 2,500,000 to get a LTIFR = 2. 39). Take the square root of the result to calculate the natural angular frequency: ω =√k/M = √164 1/s2 = 12. Visit Discussion Forum for Online TRCF Calculator tool. g. Most companies choose to calculate LTIFR per 1 million man hours worked. 28. How to calculate NMFR To calculate NMFR, divide the total number of near misses by the total exposure hours and multiply by a constant (typically 1,000,000 or 200,000) to obtain. 004 0. Don’t take shortcuts. In order to find the denominator of the equation, you need to double the value of pi, 3. 12 There has been one previous study from Ghana, which estimated that maternal near-misses outnumbered mortality at a ratio of about 3:1 in a single setting. 1 Tier 3 Indicator Purpose 6. 1 per 1,000 and 1,007 per 100,000 live births, respectively. 5. 1-866-777-1360 M-F 6am - 4pm PST. Hal ini salah satunya untuk melihat kinerja program K3 dalam upaya penurunan angka kecelakaan kerja dan penyakit akibat kerja. Calculate OSHA severity rate, DART rate, total case incident rate, and more here. 18 found that one way to reduce the rate of medication errors, near-misses. 1. HSE - Berger Paints. 04 (95% CI, 4. Incidents are the most worrying safety events, but one of the safety metrics which also needs to be monitored 'closely' is reported near misses. This paper discusses findings from a project exploring experiences of cycling near misses. 2: In-hospital maternal mortality ratio (per 100,000 live births) 359: Mortality index (MD/SMO) 0. Incidence of maternal near-miss, maternal near-miss to maternal mortality ratio, and cause of and factors associated with maternal near-miss. 23% in studies which had disease-specific criteria while it was from 0. Sample calculation: Controbax Berlin GmbH had a workforce of 342 employees in February 2021. Most companies choose to calculate LTIFR per 1 million man hours worked. A near miss is an incident that would have resulted in a loss such as an injury or property damage, under only slightly different circumstances. This would be a pretty high TRIFR, as you can see some TRIFR averages here. Lost time injuries – Employees Lost time injuries – Contractors 0 100 200 300 400 500 600 700 0 2 4 6 8 10 12 14 Check specific incident rates from the U. 1 (95% CI = 37. 10 Studies from Karachi and neighbouring country India showed maternal near-miss rate was around 16. Enter N = Number of Recordable Injuries and/or Illnesses in One Year EH = Total Number of Hours Worked by all Employees in One Year 200,000 = Equivalent of 100 Full-Time Employees Working 40 Hour Weeks. Ensure that your data is up-to-date and reliable. (accident rate): 16. potential near miss incidents. These events can have significant consequences for individuals in this population and further study can inform practices to reduce both maternal morbidity and mortality. The corresponding incidence of near miss in the study sample therefore ranged from 7. LTIFR = (14 / 800,000) = 0. The easy part of TRIFR calculations, like all safety KPIs ( see more here) is the measurement itself. Results During the one-year period, there were a total of 238 maternal near-miss cases and 29,697 live births in all participating hospitals, which provides a maternal near-miss incidence ratio of. Incidence of near-miss events in African hospitals. Results The structured record review identified 19. At Ecesis, we have easy-to-use, EHS software and a mobile app that helps you manage, track, and report incidents. LTIR = (Total LTIs / Total number of hours) × 200,000 then, in the frequency formula: F = (12 x 106)/2,189,243 = 5. and “near-miss incident frequency rate”: 200000. : ABC Manufacturing Company’s Frequency Rate is 40. 2/1000 live births and 295/100000 live births respectively. An employee who witnesses a near miss incident must complete the Near Miss Reporting form (located in the main office) and submit to a Manager or. Historically, frequency measures of injury outcome have been at the centre of work health and safety performance evaluation. 6 fatalities per 100,000 full-time equivalent (FTE) workers, up from 3. Near miss hazard and incident reporting and management are essential elements of the USC Work Health and Safety Management System, supporting the effective management of health, safety and wellbeing hazards and risks, that may occur or have the potential to occur at USC or as a result of USC activities. An LTIFR of 7, for example, shows that 7 lost time injuries occur on. RWI or Restricted Work Injury is (a work-related. Using 2014 and 2015 data from the UK Near Miss Project, this paper therefore aims to examine the consistency of incident rates for cycling near misses across these two years. 81 Hz/rad. 1. TRIR = (Number of OSHA recordable incidents) X 200,000 / (Total number of hours worked) Other Calculators. The easy part of TRIFR calculations, like all safety KPIs ( see more here) is the measurement itself. 01 per 1000 live births in all participating hospitals. Ambulatory patients may experience ADEs at even higher rates, as illustrated by the dramatic increase in deaths due to opioid medications,. Of the total number of injuries in 2020, 15,799 (42. An effective NMS aims to quickly recognise near misses from the business operations in order to apply prevention measures. Rumus: FSI = ( Frekwensi Rate x Severity Rate) / 1,000A lower incident rate means equipment is operating more efficiently than usual. The minimum sample size required were: 64 near miss cases to 256 controls. DART (Days Away, Restricted, or Transferred) rate is calculated by dividing the number of DART cases x 200,000 by the number of hours worked for all employees and supervised. Near-miss occurred most frequently in urban. There is international interest in monitoring severe events in the obstetrical population, commonly referred to as maternal near miss or severe maternal morbidity. 00 1. The fatal work injury rate was 3. Near miss provides indirect evidence related to health system, emergency obstetrics services, and the standard of care [3,4,5]. Results Average maternal near-miss incidence ratio (MNMIR) for ICU admission was 3. 2/1,000 live births. 0, with the average TRIR in construction being. Incidence Rate = Total no. 9 per 1000 live births . Lost Time Injury Frequency Rate (LTIFR) This KPI calculates the number of lost-time injuries per million hours worked. They could have worked a theoretical total of 49,248 normal working hours, but a total of 426 hours were lost due to accidents. the San Francisco Bay Area suggests the frequency of near misses leads to a greater impact on perceived danger than injury collisions. The formula for calculating incident rates varies depending on the type you’re interested in. Luckily, that's an easy task. One clear illustration comes from the accident triangle, which depicts the relationship between accident severity and accident frequency. Heinrich observedThis is a 2-hour tutorial session which will focus on the computation of safety performance measurement, Frequency Rate, and Severity Rate. We judged 37% of the adverse events, and all of the near misses, to be preventable (errors); 33% of the near misses were intercepted. A near-miss cluster is defined as a group of the near- miss reports with more than 1 element (it can be generalized to more than n 0 elements). 602], p = 0. OSHA calculates this number as a rough measure of a company’s safety performance. The reason for calculating an accident frequency rate is to. This study was undertaken to assess the feasibility of a near-miss reporting system in primary care practices. It is a measure of the number of injuries per 1,000 employees and is usually calculated over a period of time, e. ([Number of lost time injuries in the reporting period] x 1,000,000) / (Total hours worked in the reporting period) RIFR: Reportable Injury Frequency Rate Here is the TRIR calculation formula set forth by OSHA: TRIR = Number of Incidents x 200,000 / total number of hours worked in a year. e. Reporting of near-miss safety events is commonly assumed to enhance safety in organizations, as such reporting enables managers to identify and address accident risk factors. 6. Now, let’s try and repeat these results with poisson regression. At one department of radiology in New York, 16% of near-miss events were reported to be due to wrong-patient events , and the estimated rate of misidentified patient events at the Mayo Clinic was reported as 0. 03 2. Transcribing: in a paper-based system, an intermediary (a clerk in the hospital setting, or a. The easy part of TRIFR calculations, like all safety KPIs ( see more here) is the measurement itself. 1 x 100,000 divided by 80,000 = accident frequency rate of 1. Reflected in theMethods and caveats relating to the calculation of incidence rates from THOR-GP data [back to top] IIDB - Industrial Injuries Disablement Benefit Scheme Index of IIDB tables - Last updated 11/23. 5 Maximizing the Value of Near Miss Reporting • Rates are for all full-time employees. Near miss events do not result in personal harm or property damage. Please note, that very few companies use the severity rate as a calculation, as it only provides an average. 22 %, respectively. OSHA uses the TCIR to monitor high-risk industries, and they also allow EHS managers to track incidents and discover patterns across different departments or facilities. All 3 types of injuries declined from 2019. This results in a number ranging from 1 to 16. 66 Total Recordable Injury Frequency Rate 34. 9±5. . Thus Near Miss Ratio (NMR) and Maternal Mortality Ratio (MMR) of our hospital is 52. For example, if you have 51 cache hits and three misses over a period of time, then that would mean you would divide 51 by 54. The frequency of accidents and near-misses has traditionally served as a concept for measuring safety. 1 injury. This would be a pretty high TRIFR, as you can see some TRIFR averages here. and. Worldwide, the neonatal mortality rate (NMR) fell by 51%, from 37 deaths per 1000 live births in 1990 to 18 per 1000 live births in 2017. You can see more. Item Failure may occur Potential Impact Failure. Keep in mind that in the end the most important thing in near miss reporting is conducting corrective actions. This means that for every one million hours worked in the facility, there are 40. Introduction. Results: Out of total 2371 live births 124 Near Miss Events occurred among which 7 expired. (2) The near miss frequency rates (NMFR) for direct employees and contract employees were 0. It gives information about how frequently accidents occur and is represented as I r = I n *100000/ N mh or Injury Frequency Rate = Number of Disabling Injuries *100000/ Man Hour. Near Miss reporting There is a decrease in the number of hazard and near miss reports received in January Injuries to. The lost time injury rate (LTIR) is calculated using a simple formula, where the total number of lost time injuries in a given period is divided by the total number of hours worked in that period and then multiplied by 200,000. Calculating Incident Rate. 61, p < . There are others but I think this is what you are trying to calculate. 32 Contract Employees 0. 14 = 6. It could be as little as one day or shift. 11 Tips For Managers To Implement And Use The Incident Rate Formula In Their Organization Don’t Pass On Using Metrics. Lost Time Injury Frequency Rate: the number of lost time injuries that occurred during the reporting period. Severity Rate (S. 7 per cent less than the previous year, and in parallel to this, the reporting frequency rate (HPIs per million workhours) also dropped. Relative frequency comparison between near-misses in the study and road accidents for all of. See how your rates compare to the industry average TRIR for your industry (based on NAICS codes & BLS. 6 : 1, and mortality index was 14. 64 1. Jumlah lembur 20. Tier 3: an occurring incident with low risk actual or potential outcomes. 8/1000 live births, maternal near miss to mortality ratio was 5. Of the 167 near misses, 19% were deemed low risk, 25% moderate risk, 30% high risk, and 26% critical risk. The formulae used to calculate the incidence estimate and rate of over 3-day absence injury relating to individuals working in the last 12 months for overall and individual characteristics such as age and sex are given by: Incidence of over-3-day absence injury. 3) per 1000 live births, respectively. There were 7390 deliveries and 131 “near miss” cases during the study period. EMR is important internally, but more important externally. The near miss frequency rate (NMFR) is the number of near misses per million hours worked in a given period. While we expected a high degree of heterogeneity between the. To calculate incident rates accurately, you need to gather essential data. In the United States, the most common of these is the total recordable incident rate (TRIR). 6% among women from Ntoroko. The occurrence frequency of incidents is relatively high because the project involves dozens of construction sites and tunneling work typically has a greater exposure to risks due to. 4, which means there were 2. : Frequency Rate (FR) = (Number of Recordable Incidents / Total Hours Worked) x 1,000,000 Frequency Rate (FR) = (20 / 500,000) x 1,000,000 Frequency Rate (FR) = 40. : ABC Manufacturing Company’s Frequency Rate is 40. Also differences in long-lasting diseases were relevant. 95 2. The maternal near-miss incidence ratio was 16. Divide that by 80,000, and you’ll get a recordable incident rate of 7. The present study was conducted to investigate the frequency of near-miss events, to calculate the mortality index for each event and to. The abortion-related near-miss rate (72) and ratio (450) in our study were higher than those estimated in most studies included in a 2012 systematic review by Adler et al. 1%) were fatal injuries and 21,176 (57. 12 months ago, Australian Surfer,. 3 The mortality index (i. 04% and 4. The accident rate is defined as the ratio between the number of accidents which happened in a given year and the number of flights conducted during that same year. , 2016) that introduce implicitly a random or probabilistic perspective of both occurrence and frequency of near misses anchored in deterministic representation and stability for a long time. BIMCO is calculating the safety and health performance in percentage by a mathematical approach: HSP = (LTIF + HSD + LTSF + PIR + F&E + TRCF + TRCF. It looks like it is designed to calculate baud rate from register settings on a specific processor. We can therefore calculate the company’s illness rate as follows: (426 ÷ 49,248) x 100%) = 0. Near Miss Reports 34. The maternal near miss incidence ratio 18. Please note that in addition to incident. Identifying and eliminating near misses are a significant means of preventing accidents. Accident frequency rate is one of the standard safety measures which companies use to identify and analyse the number of occupational accidents which take place in the workplace. Average Access Time ( tavg ) : tavg = h X tc + ( 1- h ) X ( tc + tm ) = tc + ( 1- h ) X tm. LOST WORKDAY RATE – a mathematical calculation that describes the number of lost work days per 100 full-time employees in any given time frame. Of all, 55 (15. e. 34. S. So his updated triangle, known as “the Bird’s Triangle,” showed a relationship of one serious injury accident to 10 minor injury accidents, 30 damage-causing accidents, and 600 near misses. 46 0. 001). Sum all the lost time of accident cases during the period you want to calculate the LTIF. 009 0. Incidence and near-miss rates can be used to show the relative level of injuries and illnesses among industries, companies, or related operations within a single company. The formula for the mean hazard ratio is the same, but instead of observed and expected at time t, we sum the observations and expected observations across all time slices. It’s sometimes referred to as Total Case Incident Rate (TCIR) or the OSHA incident rate. 4% compared to the 2019 DIFR (9. The parameters for the calculation were: prevalence of near misses of 17% (based on previous work in Nigeria), power of 80% at 5% statistical significance level. The output of this all injury frequency rate calculation is your AIFR 'score' and indicates how many injuries are suffered when standardised across 100 employee working 40 hours per week for one year. 4 per 1000 live births. and. Westminster. 4% (95% CI 0.