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Table 2 The association between basic characteristics and adverse pregnancy outcomes

From: High starchy food intake may increase the risk of adverse pregnancy outcomes: a nested case-control study in the Shaanxi province of Northwestern China

  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
  1. a Multivariate regression analysis and adjustment of age and residence, economic situation, smoking and alcohol intake
  2. * p < 0.05