Table 1.
Sample comparison between the original NIHPD Objective 1, Visit 1 sample, and the Visit 1 sample used in this study. When appropriate, means ± standard deviations are provided.
| Sample | Objective 1 Visit 1 (n = 433) | Accepted Visit 1 Sample (n = 296) | Statistics (if applicable) |
|---|---|---|---|
| Age (Years) | 10.4 ± 3.8 (4.6 to 18.3 years) | 11.3 ± 3.7 (4.9 to 18.3 years) | t = 3.17, p < 0.002 |
| Proportion of Males | 48% | 45.2% | χ2 = 0.301, p = 0.583 |
| Proportion of low/medium/high adjusted SESa | 24.4% / 40.8% / 34.8% | 22.6%/41.2%/36.1% | χ2 = 0.185, p = 0.912 |
| Proportion of Caucasians/African American/Otherb | 73.5% / 8.4% / 18.1% | 74.7% / 8.4% / 16.9% | χ2 = 0.099, p = 0.951 |
a
Based on the US Department of Housing and Urban Development method for comparing family income levels as a function of regional costs of living.
b
The ‘Other’ category includes American Indian, Alaskan Native, Asian, Native Hawaiian or Other Pacific Islander, and those for whom ethnicity or race was not provided, or whose parents came from different racial or ethnic backgrounds.