Seeking Help: How Do I Calculate Lost Time Injury Frequency Using IS:3786-1983?

Can anyone send details of the following standard "IS:3786-1983, Methods for computation of frequency and severity rates for industrial injuries and classification of industrial accidents." for calculating lost time injury frequency/severity rate, etc.

Mano

Calculation of Frequency Rate for Lost-Time Injuries

The frequency rate shall be calculated both for lost-time injury and reportable lost-time injury as follows:

- **FA** = Number of lost-time injuries × 1,000,000 / Man-hours worked
- **FB** = Number of reportable lost-time injuries × 1,000,000 / Man-hours worked

Notes on Frequency Rate Calculation

- **NOTE 1** - If the injury does not cause a loss of time in the period in which it occurs but in a subsequent period, the injury should be included in the frequency rate of the period in which the loss of time begins.

- **NOTE 2** - If an injury causes intermittent loss of time, it should only be included in the frequency rate once, that is, when the first loss of time occurs.

- **NOTE 3** - Since the frequency rate is based on the lost-time injuries reportable to the statutory authorities, it may be used for official purposes only. In all other cases, frequency rate FA should be used for comparison purposes.

Calculation of Severity Rate

The severity rate shall be calculated from man-days lost due to lost time injury and reportable lost time injury as follows:

- SA = (Man-days lost due to lost time injury x 1,000,000) / Man-hours worked
- SB = (Man-days lost due to reportable lost time injury x 1,000,000) / Man-hours worked

NOTE: Since the severity rate is based on the lost time injuries reportable to the statutory authorities, it should be used for official purposes only. In all other cases, severity rate SA should be used for comparison purposes.

If anyone wants the concerned IS code, please provide an email address. I will send the same IS code. I can't post the IS code on this forum due to copyright rules.

Thanks & Regards.

Please find attached IS: 3786-1983 as per your requirement.

Regards,
Krishna Verma
[Phone Number Removed For Privacy Reasons]

Please clarify if a fatality is treated as an LTI or not. I am having some issues with my HSE manager in calculating the frequency rate. He mentioned that a fatality is not considered an LTI. Please help me rectify this problem.

Regards,
Ahammad

Please go through Appendix A of IS 3786-1983. It clearly mentions the answer to your query. Fatality is not treated as Lost Time Injury (LTI). However, in many situations, 6000 man-days lost is considered for calculating LTI, similar to the case of fatality.

For example, if there is 01 LTI and 01 Fatal, and the man-hours worked are 5.16 million, then what is FR & SR? Please provide examples to clarify my confusion.

Regards,
Ahammad

Lost Time Injury Frequency Rate Calculation

If 01 LTI equals 25 man-days lost and 01 Fatal equals 6000 man-days lost, and the hours worked amount to 5.16 million, then what is the Frequency Rate (FR)? Please provide examples to clarify my confusion.

Regards,
Ahammad

Frequency rate = 0.387596899

Severity rate = 1167.635659

Please go through the attachment for more details.

Regards

Thank you very much, sir. My calculation is also like this, but our manager said in FR we must consider only LTI, not fatal. Then I had a doubt, so I sent a request to CiteHR.

Thanks a lot, sir.

Regards,
Ahammad

You should have given me a call before referring to what I have suggested or replied to you regarding FR. I received a call from someone at GDCL. I cannot recall his name. Whoever it was, if his intention was to clear the concept or share knowledge, I would welcome that. However, it seems he was more interested in conveying his ideas to me and persuading me to agree with them.

For the future, please do not blindly follow the suggestions you receive through this forum. They may also be incorrect. Most of the time, when I reply, I ensure that I am satisfied with the answer I am posting before responding.

Arguments Presented

Now, here are his arguments, which I felt I should present to the forum to get the views of others:

1. He claims that LTI and Fatal incidents are not the same, and we do not need to consider or count fatal accidents when calculating the FR. For example, if one LTI and one Fatal accident occur, the total number of accidents to be calculated for FR is one.

I still do not agree with this.

If two fatal accidents occur in a plant and no LTIs happen, will the frequency rate be "ZERO"?

What is the logic behind such an argument?

Mr. Ahammad, I urge you to share this website with your friend/manager who is debating this topic with you. Let him provide his input on this forum. If it is correct and justifiable, we will learn from it.

We are also awaiting comments from other members.

Thank you.

Dear Sir,

If one phalanx of the ring finger or any finger was amputated, is this considered an LTI or MTI? If it is an LTI, is there any written evidence by the government authority?

Thank you.

Dear All,

Please provide the formula for the FSI (Frequency-Severity Index).

Kindly take necessary action.

Mr. Dipil Kumar Vasu,

As per your reply, "Fatality is not treated as LTI," I cannot find this statement in Appendix A of IS 3786-1983. Can you tell me where it is?

Nagarajan

Hi Nagarajan, in Appendix A, nowhere is it written so. But how come this confusion is arising? Fatality means someone loses his/her life. Lost time injury means he/she is still alive with injuries restricting normal working even after 48 hours of the incident. The severity of injuries is what differs.

Now for calculation purposes, in IS 3786, you can see the number of man-days lost to consider against Fatal and LTIs (Cases of total disablement under Part A of Appendix A - restricting further employment of the individual) is 6000 days.

Furthermore, when you refer to Part B - Partial disablement, other LTIs are mentioned with a fewer number of man-days lost to consider for the calculations.

Hope this helps. Please feel free to write in case you need more clarifications.

Dear All, BIS has released the amendment and announced the withdrawal of IS 3786 old version. Very soon, it will be available on a free resource website. Please refer to the notification released by the Government of India.