ROLLAGEWK is a 3-digit-numeric variable.
0: Not in Universe
996: Never rolled over
998: Unknown whether rolled over
999: Unknown when rolled over
For sample persons under 5 years old, ROLLAGEWK reports the age (in weeks) at which the child first rolled over on his or her own on purpose.
For related variables, please use the IPUMS NHIS search function and drop-down menus.
- 1981: Sample persons under age 5.
- 1981 : SAMPWEIGHT