Characteristics of National Collaborative Perinatal Project (NCPP) participants selected for follow up, interviewed, and included in the analytical sample
| Characteristics | Selected for follow up (%) n = 1062 | Full interviewed sample (%) n = 720 | Analytical sample (%) n = 633 |
|---|---|---|---|
| *Birth weight less than 2500 grams. †Percentages do not total 100% because of missing data. ‡General eduation development degree (high school equivalency). | |||
| Any illness | |||
| Yes | – | – | 17.5 |
| No | – | – | 82.5 |
| Self perceived health | |||
| Excellent | – | – | 32.2 |
| Good | – | – | 45.0 |
| Fair | – | – | 18.4 |
| Poor | – | – | 4.4 |
| Full scale IQ, age 7 | |||
| 80–89 | 28.8 | 24.7 | 23.7 |
| 90–99 | 34.4 | 33.1 | 33.6 |
| 100–109 | 23.3 | 25.4 | 25.8 |
| 110+ | 13.5 | 16.8 | 16.9 |
| Sex | |||
| Male | 64.5 | 61.3 | 61.1 |
| Female | 35.5 | 38.8 | 38.9 |
| Race | |||
| White | 77.8 | 77.1 | 77.9 |
| Non-white | 22.2 | 22.9 | 22.1 |
| Low birth weight* | |||
| Yes | 9.3 | 10.1 | 9.9 |
| No | 90.7 | 89.9 | 90.1 |
| Learning disability | |||
| Yes | 42.6 | 42.4 | 42.5 |
| No | 57.4 | 57.6 | 57.5 |
| Socioeconomic status, age 7† | |||
| Lowest quartile (0.2–2.5) | 23.5 | 24.2 | 23.8 |
| Middle-low (2.6–4.0) | 27.3 | 25.6 | 24.8 |
| Middle-high (4.1–5.6) | 23.2 | 23.1 | 24.5 |
| Highest quartile (5.7–9.6) | 22.3 | 23.2 | 22.9 |
| Attained education | |||
| <High school | – | 18.2 | 17.5 |
| GED‡ | – | 14.4 | 13.9 |
| High school graduate | – | 19.9 | 20.7 |
| Beyond high school | – | 35.4 | 35.2 |
| College degree or more | – | 12.1 | 12.6 |