Table 1. Comparisons of Preintervention Sample Characteristics for Randomized Clinical Trial Population and Samples.
| Characteristic | 1 | 2 | 3 | 4 | 5 | |||
|---|---|---|---|---|---|---|---|---|
| RCT Population (n = 936) | Evaluation Eligible (n = 605) | P Valuea | Evaluation Participating (n = 316) | P Valueb | Intervention Participating (n = 158) | Control Participating (n = 158) | P Valuec | |
| Infant birth characteristics | ||||||||
| Birth risks, mean (SD), No. out of 5 | 1.0 (1.0) | 1.0 (1.0) | .95 | 1.0 (1.0) | .88 | 1.1 (1.0) | 0.8 (0.9) | <.01 |
| Female, No. (%) | 451 (48.2) | 293 (48.4) | .93 | 161 (50.9) | .40 | 73 (45.9) | 88 (56.1) | .07 |
| Mother birth characteristics, No. (%) | ||||||||
| Cesarean delivery | 269 (29.6) | 173 (29.3) | .90 | 86 (27.7) | .53 | 45 (28.7) | 41 (26.8) | .71 |
| Multiple births | 32 (3.4) | 24 (4.0) | .57 | 15 (4.7) | .28 | 10 (6.3) | 5 (3.2) | .19 |
| Medicaid or no insurance | 559 (62.3) | 348 (59.9) | .35 | 197 (64.8) | .44 | 100 (65.8) | 97 (63.8) | .72 |
| Adolescent mother | 48 (5.1) | 32 (5.3) | .89 | 21 (6.6) | .31 | 10 (6.3) | 11 (7.0) | .80 |
| Age, mean (SD), y | 29.2 (6.0) | 29.6 (6.0) | .19 | 29.4 (6.2) | .63 | 30.0 (6.2) | 28.8 (6.2) | .10 |
| Race/ethnicity, No. (%) | ||||||||
| White | 503 (53.7) | 327 (54.1) | .91 | 178 (56.3) | .42 | 95 (59.7) | 83 (52.9) | .22 |
| Black | 346 (37.0) | 228 (37.7) | .78 | 120 (38.0) | .75 | 56 (35.2) | 64 (40.8) | .31 |
| Other | 87 (9.3) | 50 (8.3) | .49 | 18 (5.7) | .05 | 8 (5.0) | 10 (6.4) | .61 |
| Hispanic | 243 (26.0) | 146 (24.1) | .42 | 90 (28.5) | .38 | 54 (34.0) | 36 (22.9) | .03 |
a
The P value of column 2 comes from χ2 or t test between columns 1 and 2.
b
The P value of column 3 comes from χ2 or t test between columns 1 and 3.
c
The P value of column 5 comes from χ2 or t test between columns 4 and 5.