Table 1.
Participant characteristics, demographics, and IQ scores
| Preterm (n = 70) |
Full Term (n = 79) |
|||||
|---|---|---|---|---|---|---|
|
Participant Characteristicsa |
Mean (SD) | Range | Mean (SD) | Range | t or X2 | p |
| Age (years) | 4.6 (.76) | 3.0–5.9 | 4.4 (.82) | 3.1–5.9 | −1.5 | .135 |
| Perinatal Data | ||||||
| GA (weeks) | 29.6 (2.6) | 24–34 | 39.3 (1.4) | 37–42 | 27.4 | <.001* |
| Birthweight (g) | 1365 (455) | 468–2495 | 3331 (507) | 2239–4510 | 24.8 | <.001* |
| Demographicsb | Preterm | Full Term | p | |||
| Race, n (%) | .064 | .876 | ||||
| White | 42 (60) | 49 (61) | ||||
| Nonwhite | 28 (40) | 31 (39) | ||||
| Ethnicity, n (%) | 1.5 | .480 | ||||
| Nonhispanic/ Nonlatino |
47 (67) | 60 (76) | ||||
| Hispanic/Latino | 8 (11.4) | 6 (7.6) | ||||
| Mixed | 15 (21.4) | 13 (16.5) | ||||
| Gender, n (%) | 2.4 | .102 | ||||
| Male | 40 (57) | 35 (44) | ||||
| Female | 30 (43) | 45 (56) | ||||
| Maternal Education, n (%) |
5.1 | .029* | ||||
| < master’s degree |
44 (63) | 35 (45) | ||||
| ≥ master’s degree |
26 (37) | 43 (55) | ||||
| Cognitive Scores | Mean (SD) | Range | Mean (SD) | Range | t | p |
| IQa | 101.9 (15) | 73–127 | 110.2 (13) | 82–139 | 3.7 | < .001* |
| Proportionsb | ||||||
| n (%) with IQ score <85 | n (%) with IQ score <85 | X2 | p | |||
| 10 (14.3) | 1 (1.3) | 9.2 | <.001* | |||
a
Data analyzed by t-test
b
Data analyzed by chi-square (asymptotic or exact significance: 2-sided)