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Table 1 The characteristics of pregnant women between case and control group

From: Maternal exposure to life events during pregnancy and congenital heart disease in offspring: a case-control study in a Chinese population

Variables, n (%) Case group Control group χ2 value p value
(n = 699) (n = 1581)
Maternal age
 <25 years 217 (31.04) 165 (10.44) 147.88 <0.001
 25~30 years 350 (50.07) 1009 (63.82)
 >30 years 132 (18.89) 407 (25.74)
Maternal residence
 Urban 237 (33.91) 1094 (69.20) 248.45 <0.001
 Rural 462 (66.09) 487 (30.80)
Maternal education
 ≥ College 241 (34.48) 1237 (78.24) 407.12 <0.001
 < College 458 (65.52) 344 (21.76)
Paternal education
 ≥ College 253 (36.19) 1250 (79.06) 396.51 <0.001
 < College 446 (63.81) 331 (20.94)
Family history of CHD
 No 1552 (98.17) 665 (95.14) 16.560 <0.001
 Yes 29 (1.83) 34 (4.86)
History of parturition
 No 410 (58.66) 1217 (76.98) 79.61 <0.001
 Yes 289 (41.34) 364 (23.02)
History of abortion
 No 422 (60.37) 1014 (64.14) 2.95 0.086
 Yes 277 (39.63) 567 (35.86)
Infection during periconception
 No 245 (35.05) 787 (49.78) 42.44 <0.001
 Yes 454 (64.95) 794 (50.22)
Abnormal prenatal examination
 No 549 (78.54) 1453 (91.90) 80.84 <0.001
 Yes 150 (21.46) 128 (8.10)
Positive events
 No 539 (77.11) 889 (56.23) 90.29 <0.001
 Yes 160 (22.89) 692 (43.77)
Negative events
 No 402 (57.51) 1029 (65.09) 11.90 <0.001
 Yes 297 (42.49) 552 (34.91)