Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Demographic characteristics of index children
| Index child characteristics | Mean | SD |
|---|---|---|
| Age (n = 408) | 22 months | 16 |
| n | (%) | |
| Gender (n = 424) | ||
| Female | 214 | (50.5) |
| Male | 210 | (49.5) |
| Birth order (n = 423) | ||
| Youngest | 410 | (96.9) |
| 2nd Youngest | 12 | (2.8) |
| 3rd Youngest | 1 | (0.2) |
