SMILAGEWK is a 3-digit-numeric variable.
0: Not in Universe
996: Never smiled
998: Unknown whether smiled
999: Unknown when smiled
For sample persons under 5 years old, SMILAGEWK reports the age (in weeks) at which the child first smiled at someone when the other person talked to or smiled at the child without touching her or him.
For related variables, please use the IPUMS NHIS search function and drop-down menus.
- 1981: Sample persons under 5 years old.
- 1981 : SAMPWEIGHT