Table 2 The association between basic characteristics and adverse pregnancy outcomes
| Â | Overall adverse pregnancy outcomes | ||
|---|---|---|---|
N (%) | OR(95% CI) | OR(95% CI)a | |
Age | |||
  ≤ 25 | 1 (4.0) | 0.19 (0.025,1.465) | 0.184 (0.023, 1.485) |
 26–30 | 31 (17.9) | 1.000 | 1.000 |
 31–35 | 19 (24.7) | 1.501 (0.785, 2.867) | 1.438 (0.712, 2.902) |
  > 35 | 12 (48.0) | 4.228 (1.762,10.149)* | 4.743 (1.786,12.599)* |
Residence | |||
 suburb/rural | 54 (19.6) | 1.000 | 1.000 |
 city | 9 (37.5) | 2.467 (1.025, 5.937) * | 2.192 (0.682, 7.041) |
Education | |||
 junior high school or below | 7 (36.8) | 2.474 (0.896, 6.835) | 0.671 (0.153, 2.940) |
 senior high schoolor graduate | 24 (19.0) | 0.998 (0.547, 1.821) | 0.863 (0.434, 1.716) |
 undergraduate or above | 29 (19.1) | 1.000 | 1.000 |
Economic situation (per month) | |||
 poor level | 8 (25.8) | 1.075 (0.312, 9.694) | 1.153 (0.322, 4.123) |
 moderate level | 41 (19.2) | 0.733 (0.342, 1.567) | 0.827 (0.362, 1.887) |
 good level | 11 (24.4) | 1.000 | 1.000 |
Occupation | |||
 peasants | 6 (31.6) | 1.814 (0.661, 4.980) | 1.493 (0.375, 5.945) |
 others | 57 (20.3) | 1.000 | 1.000 |
Smoking | |||
 yes | 3 (60.0) | 62.142 (8.931,432.397)* | 59.201 (6.877,369.251)* |
 no | 7 (2.37) | 1.000 | 1.000 |
Alcohol intake | |||
 yes | 5 (62.5) | 6.724 (1.562, 28.952) * | 6.583 (1.337, 26.589) * |
 no | 3 (1.03) | 1.000 | 1.000 |