TABLE 3.
Proportion of children with scores below cutoff in national and NBCS samples
| Communication |
Gross motor |
Fine motor |
Problem-solving |
Personal-social |
||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Age | N.U.S. %Delay | NBCS %Delay | N.U.S. %Delay | NBCS %Delay | N.U.S. %Delay | NBCS %Delay | N.U.S. %Delay | NBCS %Delay | N.U.S. %Delay | NBCS %Delay |
| 2 months | 4.5 | 0.0** | 5.4 | 8.7 | 6.8 | 1.6** | 3.1 | 3.2 | 4.3 | 0.6** |
| 4 months | 4 | 9.7* | 4.4 | 11.1* | 4.3 | 5.6 | 4.1 | 13.9** | 4.2 | 11.1* |
| 6 months | 2.8 | 0.9 | 4.1 | 10.8** | 6.5 | 3.7 | 5.1 | 8.4* | 5.1 | 7.9 |
| 8 months | 5.4 | 1.4* | 6.4 | 6.9 | 5.6 | 19.4** | 6.2 | 9.0 | 5.2 | 8.3 |
| 10 months | 4.1 | 1.6 | 5.5 | 31.9** | 5.4 | 11.9** | 5.1 | 15.9** | 4.5 | 15.1** |
| 12 months | 5.7 | 1.9** | 6 | 6.0 | 3.6 | 7.5** | 4.7 | 7.6* | 5 | 6.6 |
Abbreviations: NBCS: Navajo Birth Cohort Study; N.U.S.: national sample.
*
p < .05.
**
p < .01.