Table 1.
Participant Demographic Information
| Full Term (N = 75) | Preterm (N = 37) | ||||
|---|---|---|---|---|---|
| Mean (SD) | Mean (SD) | T-test* | df | P-value | |
| Gestational Age Birth (days) | 272.72 (9.27) | 238.68 (14.21) | 13.25 | 51.60 | <0.0001 |
| Birth Weight (grams) | 3101.24 (475.31) | 2188.22 (485.13) | 9.43 | 70.48 | <0.0001 |
| Stay in NICU (days) | 0 (0) | 10.89 (12.37) | −5.35 | 36 | <0.0001 |
| Chronological Age at MRI (days) | 22.72 (9.44) | 45.19 (14.47) | −8.59 | 51.63 | <0.0001 |
| Gestational Age at MRI (days) | 295.16 (9.87) | 283.11(10.97) | 5.65 | 65.46 | <0.0001 |
| Age at 2yr MSEL (days) | 747.53 (22.41) | 779.08 (25.14) | −6.47 | 64.91 | <0.001 |
| 2yr ELC | 107.11 (15.86) | 105.19 (15.85) | 0.60 | 71.84 | 0.549 |
| Maternal Age (years) | 30.02 (5.76) | 29.95 (6.14) | 0.07 | 67.78 | 0.947 |
| Paternal Age (years) | 32.49 (6.00) | 32.0 (8.40) | 0.31 | 54.72 | 0.751 |
| Maternal Education (years) | 15.06 (3.25) | 15.89 (3.23) | −1.28 | 72.24 | 0.205 |
| Paternal Education (years) | 15.06 (3.79) | 15.36 (2.98) | −0.45 | 86.62 | 0.652 |
| Household Income ($) | $73,094 (63,538) | $88,537 (64,870) | −1.16 | 66.53 | 0.250 |
| N | N | Chi Sq. | P-value | ||
| Male / Female | 39 / 36 | 24 / 13 | 1.18 | 0.276 | |
| Singleton / Twin | 47 / 28 | 4 / 33 | 24.81 | <0.0001 |
*
calculated using Welch’s two-sample, two-tailed t-test assuming unequal variance