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Month of injury or poisoning

Codes and Frequencies

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For all injury and poisoning episodes, IRMONTH reports the month in which the injury or poisoning episode occurred. For the day of the week on which the injury occurred, see IRDAY.

If the person could not recall the month of the injury, she/he was asked a series of follow up questions to establish the approximate timing of the episode. NHIS recoded variables related to imputed injury/poisoning episode timing are available through IRDAYSR, which reports the number of days between the episode and the interview, IRDAYSLB, which reports the lower bound for number of days between the episode and the interview, and IRDAYSUB, which reports the upper bound of the number of days between the episode and the interview. For injury/poisoning episodes with complete timing information, the values for IRDAYSR, IRDAYSLB, and IRDAYSUB are all equal.

IRMONTH is an injury-level variable.

IRMONTH is part of a series of variables initiated in 1997 that systematically report persons' injuries and poisonings, the cause, what the person was doing while sustaining the injury or poisoning, and where she/he was at the time of the injury or poisoning. For related variables and additional information, please see the User Note on Injuries and Poisonings or use the IPUMS NHIS search function and drop-down menus.


There are no comparability issues.

Prior to 2000, persons were asked about injuries and poisonings separately. To improve comparability across samples, IHIS integrated all episode level data as a single record type. Episodes that were originally released by NHIS in the poisoning files for 1997-1999 can be identified using the variable IRPOISYN.


  • 1997-2013; 2014 2015 2016 2017: All injuries and poisioning episodes.


  • 1997-2017