Table 1. Baseline Demographic Characteristics by Race and Ethnicity.
| Characteristic | Participants, No. (%) | ||||
|---|---|---|---|---|---|
| White | Black | Hispanic | Asian | All | |
| Total | 281 (28.2) | 249 (25.0) | 237 (23.8) | 229 (23.0) | 996 (100) |
| Age, y | |||||
| 25-29 | 48 (17.1) | 61 (24.5) | 52 (21.9) | 62 (27.1) | 223 (22.4) |
| 30-34 | 88 (31.3) | 49 (19.7) | 66 (27.9) | 52 (22.7) | 255 (25.6) |
| 35-39 | 93 (33.1) | 59 (23.7) | 70 (29.5) | 59 (25.8) | 281 (28.2) |
| 40-45 | 52 (18.5) | 80 (32.1) | 49 (20.7) | 56 (24.4) | 237 (23.8) |
| Age, mean (SD), y | 35.3 (5.0) | 35.4 (6.1) | 34.8 (5.3) | 34.8 (5.7) | 35.1 (5.5) |
| BMI, mean (SD) [range]a | 24.5 (5.5) [17.4-58.4] | 32.1 (8.0) [16.5-54.9] | 29.6 (6.4) [15.8-53.1] | 23.0 (3.6) [17.2-43.7] | 27.3 (7.1) [15.8-58.4] |
| Current Smokingb | |||||
| Yes | 37 (13.2) | 26 (10.4) | 12 (5.1) | 6 (2.6) | 81 (8.1) |
| No | 244 (86.8) | 223 (89.6) | 225 (94.9) | 223 (97.4) | 915 (91.9) |
| Parity statusb | |||||
| Nulliparous | 240 (85.4) | 113 (45.4) | 73 (30.8) | 141 (61.6) | 567 (56.9) |
| Parous | 41 (14.6) | 136 (54.6) | 164 (69.2) | 88 (38.4) | 429 (43.1) |
| Educationb | |||||
| High school | 7 (2.5) | 41 (16.5) | 107 (45.1) | 32 (14.0) | 187 (18.8) |
| Some college | 35 (12.5) | 108 (43.4) | 68 (28.7) | 37 (16.2) | 248 (24.9) |
| College | 138 (49.1) | 67 (26.9) | 44 (18.6) | 107 (46.7) | 356 (35.7) |
| Graduate or professional | 101 (35.9) | 33 (13.3) | 18 (7.6) | 52 (23.1) | 205 (20.6) |
Abbreviation: BMI, body mass index (calculated as weight in kilograms divided by height in meters squared).
a
One-way analysis of variance, P < .001.
b
χ2 test, P < .001.