Question: We use a rolling 12-month record of LTIs (lost time injuries), LTI frequency rates (FRs), MTIs (medical treatment injuries) and MTIFRs. Occasionally, an MTI recorded in one month will convert to an LTI in a later month due to changes in circumstances/treatment required. Should this be recorded twice or is it usual practice to alter the original record and just record only one statistic? Similarly, how is a recurrence of an injury to be captured?