I use the ATUS and AHTUS data regarding time spent with children over the different surveys (both total time spent, defined as having a child present). When examining the means of these variables (only for households for which this variable is greater than 0), there seems to be a spike from the 1998 sample onwards. In the 1995 survey, the mean was about 106 minutes, while for the 1998 survey it was 311 minutes (with the means remaining consistent in the 300+ values ever since).
As far as I know, there is no change in the variable description since 1998, and I’d like to ask if this inconsistency could be attributed to a different measuring, sampling or calculation method.
Thank you very much.