Table 3. Multinomial logistic regression models of associations between levels of occupational activity and preeclampsia and gestational hypertension, Study of Pregnancy Hypertension in Iowa, 2002-2005.
| Preeclampsia (n = 258) | Gestational hypertension (n = 233) | |||||
|---|---|---|---|---|---|---|
|
|
|
|||||
| N (Cases/Controls) | OR (95% CI) Unadjusted | OR (95% CI) BMI Adjusted | N (Cases/Controls) | OR (95% CI) Unadjusted | OR (95% CI) BMI Adjusted | |
| Any occupational work during pregnancy | ||||||
| No | 18/14 | REF | REF | 11/14 | REF | REF |
| Yes | 239/168 | 1.11 (0.54, 2.29) | 0.97 (0.45, 2.05) | 222/168 | 1.68 (0.74, 3.80) | 1.68 (0.70, 4.01) |
| Hours per week spent at work (avg/pregnancy) | 258/183 | 0.99 (0.98, 1.01) | 0.99 (0.98, 1.01) | 233/182 | 1.00 (0.99, 1.02) | 1.00 (0.99, 1.01) |
| Hours per week spent at work (avg/pregnancy) | ||||||
| 0-36 hours | 99/68 | REF | REF | 68/68 | REF | REF |
| 36.1-40 hours | 110/78 | 0.97 (0.63, 1.48) | 1.02 (0.66, 1.59) | 101/78 | 1.30 (0.83, 2.03) | 1.25 (0.78, 1.99) |
| >40 hours | 49/36 | 0.94 (0.55, 1.59) | 0.89 (0.51, 1.55) | 64/36 | 1.78 (1.05, 3.02) | 1.72 (1.00, 2.98) |
| P for trend | 0.81 | 0.74 | 0.03 | 0.04 | ||
| Carry/lift >20 pounds at work (minutes/day)a | 197/137 | 1.00 (0.99, 1.01) | 1.00 (0.99, 1.01) | 182/137 | 1.00 (1.00, 1.01) | 1.00 (1.00, 1.01) |
| Carry/lift >20 pounds at work (minutes/day)a | ||||||
| None | 139/104 | REF | REF | 136/104 | REF | REF |
| 0-10 minutes | 27/15 | 1.35 (0.68, 2.66) | 1.14 (0.56, 2.33) | 19/15 | 0.97 (0.47, 2.00) | 0.79 (0.37, 1.68) |
| > 10 minutes | 31/18 | 1.29 (0.68, 2.43) | 1.13 (0.58, 2.19) | 27/18 | 1.15 (0.60, 2.19) | 1.03 (0.52, 2.04) |
| P for trend | 0.33 | 0.67 | 0.72 | 0.92 | ||
| On feet at work (hours/day)a | 212/154 | 0.95 (0.90, 1.01) | 0.96 (0.91, 1.02) | 205/154 | 0.99 (0.95, 1.03) | 0.98 (0.95, 1.02) |
| On feet at work (hours/day)a | ||||||
| 0-1 hours | 73/46 | REF | REF | 55/46 | REF | REF |
| 2-4 hours | 58/38 | 0.96 (0.55, 1.67) | 1.04 (0.59, 1.85) | 59/38 | 1.30 (0.74, 2.29) | 1.50 (0.83, 2.70) |
| 5-7 hours | 48/46 | 0.66 (0.38, 1.14) | 0.67 (0.38, 1.19) | 44/46 | 0.80 (0.45, 1.41) | 0.90 (0.50, 1.63) |
| >7 hours | 33/24 | 0.87 (0.46, 1.65) | 0.88 (0.45, 1.73) | 47/24 | 1.64 (0.87, 3.07) | 1.74 (0.90, 3.35) |
| P for trend | 0.30 | 0.33 | 0.42 | 0.35 | ||
| Time spent standing in one place at work (hours/day)a | 215/149 | 0.95 (0.84, 1.08) | 0.92 (0.81, 1.05) | 207/149 | 1.11 (0.99, 1.24) | 1.11 (0.99, 1.24) |
| Time spent standing in one place at work (hours/day)a | ||||||
| 0 hours | 148/103 | REF | REF | 124/103 | REF | REF |
| 1 hour | 39/20 | 1.36 (0.75, 2.46) | 1.44 (0.78, 2.66) | 32/20 | 1.33 (0.72, 2.46) | 1.31 (0.69, 2.47) |
| 2-3 hours | 16/13 | 0.86 (0.40, 1.86) | 0.82 (0.37, 1.85) | 24/13 | 1.53 (0.74, 3.16) | 1.34 (0.63, 2.84) |
| >3 hours | 12/13 | 0.64 (0.28, 1.46) | 0.52 (0.21, 1.25) | 27/13 | 1.73 (0.85, 3.51) | 1.83 (0.88, 3.80) |
| P for trend | 0.45 | 0.29 | 0.06 | 0.08 | ||
| Time spent sitting at work (hours/day)a | 212/154 | 1.05 (0.98, 1.13) | 1.06 (0.98, 1.13) | 205/154 | 1.05 (0.98, 1.12) | 1.05 (0.97, 1.12) |
| Time spent sitting at work (hours/day)a | ||||||
| <1 hour | 51/41 | REF | REF | 55/41 | REF | REF |
| 1-3.9 hours | 61/53 | 0.93 (0.53, 1.61) | 0.94 (0.53, 1.68) | 49/53 | 0.69 (0.39, 1.21) | 0.70 (0.39, 1.23) |
| 4-6.9 hours | 41/26 | 1.27 (0.67, 2.41) | 1.40 (0.71, 2.73) | 45/26 | 1.29 (0.69, 2.42) | 1.36 (0.71, 2.60) |
| ≥7 hours | 59/34 | 1.46 (0.80, 2.65) | 1.52 (0.81, 2.85) | 56/34 | 1.31 (0.72, 2.36) | 1.28 (0.69, 2.37) |
| P for trend | 0.13 | 0.10 | 0.15 | 0.17 | ||
Abbreviations: OR, odds ratio; CI, confidence interval; BMI, body mass index
a
This question was only asked to those who reported working during their pregnancy.