Table 1.
Demographic and behavioral measures by group
| Group |
Analysis |
||||
|---|---|---|---|---|---|
| Measure | All (N=263) |
SRI Exposed (N=51) |
Unexposed (N=212) |
Test statistic |
p |
| Age | 28.5 ± 5.94 | 31.3 ± 5.08 | 27.8 ± 5.96 | t(261) = 3.81 | 0.0002 |
| Race | χ2(2) = 11.7 | 0.0029 | |||
| White | 187 (71.1) | 46 (90.2) | 141 (66.5) | ||
| Black | 63 (24.0) | 5 (9.8) | 58 (27.4) | ||
| Other | 13 (4.9) | 0 (0.0) | 13 (6.1) | ||
| White race | 187 (71.1) | 46 (90.2) | 141 (66.5) | χ2(1) = 11.2 | 0.0008 |
| Education level | χ2(4) = 9.77 | 0.0444 | |||
| <High school | 29 (11.1) | 4 (7.8) | 25 (11.8) | ||
| High school | 45 (17.2) | 2 (3.9) | 43 (20.4) | ||
| Some college | 62 (23.7) | 14 (27.5) | 48 (22.7) | ||
| College | 69 (26.3) | 16 (31.4) | 53 (25.1) | ||
| Graduate school | 57 (21.8) | 15 (29.4) | 42 (19.9) | ||
| Completed college | 126 (48.1) | 31 (60.8) | 95 (45.0) | χ2(1) = 4.09 | 0.0432 |
| Employed | 133 (51.8) | 22 (44.9) | 111 (53.4) | χ2(1) = 1.14 | 0.2859 |
| Marital status | TP(0) < 0.01 | 0.0285 | |||
| Single | 98 (37.3) | 12 (23.5) | 86 (40.6) | ||
| Married/cohabiting | 155 (58.9) | 35 (68.6) | 120 (56.6) | ||
| Divorced/separated | 9 (3.4) | 4 (7.8) | 5 (2.4) | ||
| Widowed | 1 (0.4) | 0 (0.0) | 1 (0.5) | ||
| Married/cohabiting | 155 (58.9) | 35 (68.6) | 120 (56.6) | χ2(1) = 2.46 | 0.1171 |
| Parity | 2.08 ± 1.15 | 2.41 ± 1.33 | 2.00 ± 1.09 | U(1) = 4.51 | 0.0337 |
| Parity | TP(0) < 0.01 | 0.1351 | |||
| 1 | 89 (34.6) | 13 (25.5) | 76 (36.9) | ||
| 2 | 99 (38.5) | 19 (37.3) | 80 (38.8) | ||
| 3+ | 69 (26.8) | 19 (37.3) | 50 (24.3) | ||
| Pre-pregnancy BMI | 27.2 ± 7.25 | 28.1 ± 6.82 | 27.0 ± 7.35 | U(1) = 2.29 | 0.1303 |
| Pre-pregnancy BMI 30+ | 74 (29.7) | 16 (31.4) | 58 (29.3) | χ2(1) = 0.08 | 0.7720 |
| Smoked tobacco | 52 (19.9) | 12 (23.5) | 40 (19.0) | χ2(1) = 0.52 | 0.4723 |
| Drank alcohol | 63 (24.0) | 11 (21.6) | 52 (24.6) | χ2(1) = 0.21 | 0.6446 |
| Used illicit drugs | 33 (12.6) | 3 (5.9) | 30 (14.2) | χ2(1) = 2.59 | 0.1074 |
| Ever breastfed | 154 (69.4) | 30 (65.2) | 124 (70.5) | χ2(1) = 0.47 | 0.4926 |
Abbreviations BMI body mass index; TP table probability from Fisher’s exact test.