Table A.1
Sample loss and size by selection criteria

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Sample selection procedure Sample size
Note: The application of selection criteria was sequential. As such, the numbers shown in the above table do not necessarily represent the number of children in the sample with a particular characteristic (e.g., children whose biological mother was not the PMK at all time points may also include some children who were not first-borns).
Table source: Statistics Canada, 2008, "The Children of Older First-time Mothers in Canada: Their Health and Development", Children and Youth Research Paper Series, Catalogue number 89-599-M.
Total number of 0 to 1-year-olds interviewed in cycles 3 through 6 18,907
Children who were dropped from the longitudinal sample -152
Additional children lost to attrition -3,094
Additional children whose biological mother was not the PMK at all time periods -3,211
Additional children who were not first-born -8,456
Additional children for whom first-born status was unknown -612
Total number of children included in this study 3,382