Table 1.
Selected characteristics of the study population according to pre-gravid body mass index, Seattle and Tacoma, Washington, USA 1996–2008
| Pregravid Body mass index (kg/m2) | ||||||
|---|---|---|---|---|---|---|
| Characteristics | Total N=3,737 |
<18.5 N=160 |
18.5–24.9 N=2,626 |
25.0–29.9 N=613 |
(≥30.0) N=338 |
P value Trend test** |
| n (%) | n (%) | n (%) | n (%) | n (%) | ||
| Age (y) mean* | 32.6±4.5 | 32.0±0.3 | 32.7±4.3 | 33.0±4.8 | 32.1±5.3 | 0.001 |
| Race, Non-Hispanic White | 3228(86.4) | 135(84.4) | 2304(87.7) | 518(84.5) | 271(80.2) | 0.001 |
| Weight, kg, at age 18* | 57.4± 9.0 | 50.3±5.4 | 55.6± 6.5 | 60.5± 9.2 | 69.5±14.3 | <0.003 |
| BMI, kg/m2 at age 18* | 20.7± 2.9 | 17.9± 1.5 | 20.0± 1.9 | 21± 2.8 | 25.3± 4.7 | <0.001 |
| Weight change, kg, since age 18* | 8± 10.9 | −0.05± 4.5 | 4.4± 5.6 | 14.3± 8.3 | 28.9± 17.3 | <0.001 |
| Education ≤ high school | 153(4.1) | 3(1.9) | 86(3.3) | 28(4.6) | 36(10.7) | <0.001 |
| Currently not employed | 693(18.5) | 38(23.8) | 485(18.5) | 101(16.5) | 69(20.4) | 0.145 |
| Married | 3401(91.0) | 147(91.9) | 2411(91.8) | 554(90.4) | 289(85.5) | <0.002 |
| Multiparous | 1386 (37.1) | 66 (41.2) | 916(34.9) | 247 (40.3) | 157 (46.4) | <0.001 |
| Physically active | 3442(92.1) | 148(92.5) | 2457(93.6) | 559(91.2) | 278(82.2) | <0.001 |
| History of hypertension | 178(4.8) | 3(1.9) | 59(2.2) | 53(8.6) | 63(18.6) | <0.001 |
| History of diabetes mellitus | 48(1.3) | 1(0.6) | 25(1.0) | 6(1.0) | 16(4.7) | <0.001 |
| Family history of diabetes mellitus | 552(14.8) | 14(8.8) | 346(13.2) | 108(17.6) | 84(24.9) | <0.001 |
| Family history of hypertension | 1870(50.0) | 74(46.2) | 1272(48.4) | 314(51.2) | 210(62.1) | <0.001 |
| Ever smoker | 1041(27.9) | 35(21.9) | 693(26.4) | 209(34.1) | 104(30.8) | <0.001 |
| Asthma | 488(13.1) | 9(5.6) | 316(12.0) | 105(17.1) | 58(17.2) | <0.001 |
*
Mean ± standard deviation otherwise Number (%)
**
continuous variable: one-way ANOVA test, categorical variables: use the Chi-Square test or Fisher’s Exact test (if the cell number <5)