It's useful to be able to evaluate your company's injury-and-illness experience over time to compare it's experience with that of your industry as a whole. To do that you need to compute your incident rate. Incident rates can, to a certain degree, help you identify problems in your workplace or progress made toward preventing work-related injuries and illnesses.
Incidence rates can be useful as a measure in evaluating your organization's safety management system. Incidence rates measure "what's already happened." They primarily measure how many fatalities, injuries, and accidents have occurred over time. Do not rely solely on incident rates: here's why.
Incidence rates are "trailing indicators." They record and summarize historical data. Incidence rates do not measure the actual "causes" of injury and illness incidents: they measure the "effect," not the cause, of the incident. Relying solely on incident rates to improve your safety management system is not effective. It's like driving down the road and looking in the rear-view mirror to stay in your lane. Other examples of trailing indicators are: workers compensation rates, equipment failure rates, unsafe behavior rates. However the most common trailing indicator remains the incident rate.
Actually, it's more important to emphasize the measurement of "leading indicators." These are the thoughts, decisions, behaviors, and activities that have the most direct influence on safety management system design, development and deployment. Incidence rates for fatalities, injuries, and accidents can be used to determine if they are leading indicators.
As long as you measure both leading and trailing indicators, you're on the right track.
Since the DART Rate is the most common incident rate used in the safety profession, it's important to know how to calculate it. You can compute the incident rate for recordable cases involving days away from work, days of restricted work activity, or job transfer using the following formula:
The formula above is quite simple and easy to use. Just follow these steps:
The Total Case Incident Rate (TCIR) is based on the number of recordable injuries and illnesses occurring among a given number of full-time workers (usually 100 full-time workers) over a given period of time (usually one year). In Europe the incident rate may be based on 500 full-time workers. It is a required calculation for companies applying for VPP status.
As you can see, the calculation for the TCIR is similar to the DART. You can calculate the TCIR using the following steps:
Here's an example. If you have 50 employees who work a total of 100,000 hours during the year and have experienced 10 recordable injuries, the DART rate would be (10 ÷ 100,000) x 200,000 = 20. So, in this example, the DART rate indicates there are 20 days away, restricted, or transferred injuries per 100 employees. The number of employees doesn't matter. The total number of injuries and the total number of hours the employees work during the year are the two important figures entered into the formula.
You can use the same formula to calculate incident rates for other variables such as cases involving restricted work activity (Column (I) on OSHA Form 300A), cases involving skin disorders (Column (M-2) on OSHA Form 300A), etc. Just substitute the appropriate total for these cases, from OSHA Form 300A, into the formula in place of the total number of injuries and illnesses.
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