Lost Time Incident RateLTIR

LTIR = (lost-time cases × 200,000) / hours worked. It is a subset of TRIR that counts only the cases with days away from work — OSHA form 300 column H. Because it filters for the cases that kept someone off the job, LTIR is a sharper severity signal than TRIR, which counts every recordable case equally regardless of whether the worker lost a day or an hour.

The trade-off is sample size. Lost-time cases are rarer than recordable cases, so LTIR is noisier at small sites and can swing on a single event. The jurisdictions that emphasise lost-time over broader recordability — and the customers that ask for it — tend to be in Europe and Australia, where the model WHS framework and the RIDDOR-style reporting rules weight days lost heavily. For most programs LTIR sits beside TRIR rather than replacing it: TRIR shows how often harm happens, LTIR shows how severe it is when it does. See TRIR and DART.