Table 5.
Baseline description of study participants by site, LIFE Study, 2005–09
| Characteristic | Michigan completed n (%) 77 (74.0) | Michigan withdrew n (%) 27 (26.0) | Texas completed n (%) 289 (72.8) | Texas withdrew n (%) 108 (27.2) |
|---|---|---|---|---|
| Females | ||||
| Age (years) | ||||
| ≤24 | 7 (9.1) | 2 (7.4) | 18 (6.2) | 12 (11.1) |
| 25–29 | 30 (39.0) | 12 (44.4) | 132 (45.7) | 43 (39.8) |
| 30–34 | 26 (33.8) | 8 (29.6) | 101 (34.9) | 31 (28.7) |
| ≥35 | 14 (18.2) | 5 (18.5) | 38 (13.1) | 21 (19.4) |
| Mean (±SD) | 30.4 (4.3) | 30.1 (4.4) | 29.9 (3.9) | 30.0 (4.6) |
| Racea | ||||
| American Indian/Alaska Native* | 0 (0.0) | 0 (0.0) | 10 (3.5) | 6 (5.6) |
| Black or African American | 2 (2.6) | 5 (18.5) | 9 (3.1) | 9 (8.3) |
| Native Hawaiian/Pacific Islander | 0 (0.0) | 0 (0.0) | 0 (0.0) | 0 (0.0) |
| White | 70 (90.9) | 22 (81.5) | 250 (86.5) | 84 (77.8) |
| Asian | 2 (2.6) | 0 (0.0) | 9 (3.1) | 2 (1.9) |
| Other** | 0 (0.0) | 0 (0.0) | 23 (8.0) | 7 (6.5) |
| Education | ||||
| <High school | 1 (1.3) | 0 (0.0) | 0 (0.0) | 2 (1.9) |
| High school graduate/GED | 4 (5.2) | 2 (7.4) | 12 (4.2) | 6 (5.6) |
| Some college/technical school | 12 (15.6) | 12 (44.4) | 41 (14.2) | 29 (26.9) |
| College graduate or higher | 60 (77.9) | 13 (48.1) | 236 (81.7) | 70 (64.8) |
| Household income ($)*** | ||||
| <10 000 | 0 (0.0) | 1 (3.7) | 2 (0.7) | 2 (1.9) |
| 10 000–29 999 | 5 (6.5) | 4 (14.8) | 5 (1.7) | 7 (6.5) |
| 30 000–49 999 | 17 (22.1) | 8 (29.6) | 29 (10.0) | 10 (9.3) |
| 50 000–69 999 | 18 (23.4) | 4 (14.8) | 29 (10.0) | 18 (16.7) |
| 70 000–89 999 | 12 (15.6) | 8 (9.6) | 67 (23.2) | 25 (23.1) |
| ≥90 000 | 23 (29.9) | 1 (3.7) | 153 (52.9) | 46 (42.6) |
| Health insurance | ||||
| No | 1 (1.3) | 6 (22.2) | 16 (5.5) | 17 (15.7) |
| Yes | 76 (98.7) | 21 (77.8) | 273 (94.5) | 91 (84.3) |
| Gravidity (no. prior pregnancies) | ||||
| Nulligravida | 28 (36.4) | 11 (40.7) | 127 (43.9) | 44 (40.7) |
| 1 | 24 (31.2) | 7 (25.9) | 89 (30.8) | 30 (27.8) |
| 2+ | 25 (32.5) | 9 (33.3) | 71 (24.6) | 34 (31.5) |
| Mean (± SD) | 1.3 (1.6) | 1.3 (1.6) | 1.0 (1.2) | 1.2 (1.4) |
| Parity (no. prior livebirths) | ||||
| 0 | 37 (48.1) | 15 (55.6) | 152 (52.6) | 59 (54.6) |
| 1 | 24 (31.2) | 7 (25.9) | 103 (35.6) | 28 (25.9) |
| 2+ | 16 (20.8) | 5 (18.5) | 31 (10.7) | 21 (19.4) |
| Mean (±SD) | 0.8 (1.0) | 0.8 (1.2) | 0.6 (0.7) | 0.7 (0.8) |
| Males | ||||
| Age (years) | ||||
| ≤24 | 2 (2.6) | 3 (11.1) | 8 (2.8) | 6 (5.6) |
| 25–29 | 24 (31.2) | 8 (29.6) | 94 (32.5) | 31 (28.7) |
| 30–34 | 26 (33.8) | 9 (33.3) | 113 (39.1) | 38 (35.2) |
| ≥35 | 25 (32.5) | 7 (25.9) | 74 (25.6) | 33 (30.6) |
| Mean (±SD) | 32.2 (4.6) | 30.9 (4.8) | 31.7 (4.8) | 31.8 (5.6) |
| Racea | ||||
| American Indian/Alaska Native | 0 (0.0) | 1 (3.7) | 13 (4.5) | 9 (8.3) |
| Black or African American | 2 (2.6) | 4 (14.8) | 13 (4.5) | 10 (9.3) |
| Native Hawaiian/Pacific Islander | 0 (0.0) | 0 (0.0) | 2 (0.7) | 1 (0.9) |
| White | 71 (92.2) | 20 (74.1) | 252 (87.2) | 91 (84.3) |
| Asian | 2 (2.6) | 0 (0.0) | 6 (2.1) | 1 (0.9) |
| Other* | 2 (2.6) | 1 (3.7) | 30 (10.4) | 14 (13.0) |
| Education | ||||
| <High school | 1 (1.3) | 0 (0.0) | 1 (0.3) | 1 (0.9) |
| High school graduate/GED | 3 (3.9) | 6 (22.2) | 12 (4.2) | 20 (18.5) |
| Some college/technical school | 26 (33.8) | 11 (40.7) | 74 (25.6) | 32 (29.6) |
| College graduate or higher | 47 (61.0) | 9 (33.3) | 201 (69.6) | 54 (50.0) |
| Health insurance | ||||
| Yes | 5 (6.5) | 5 (18.5) | 21 (7.3) | |
| No | 72 (93.5) | 22 (81.5) | 268 (92.7) | 96 (88.9) |
a
Self-identified race based upon the US Census classification.
SD, standard deviation; GED, General Education Diploma.
*
P < 0.05
**
P < 0.01
***
P < 0.001. For comparison by site. Racial categories are not mutually exclusive; hence varying P-values.