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Table 1 Socio-demographic characteristics of all enrolled participants

From: Risk factors for ectopic pregnancy: a multi-center case-control study

  EP IUP OR [95 % CI] p value
n a (%) n a (%)
Age (year)
 ≤20 24 (1.00) 32 (1.33) Reference 0.16
 20–24 363 (15.06) 398 (16.47) 1.22 [0.70, 2.10]
 25–29 753 (31.23) 772 (31.95) 1.30 [0.76, 2.23]
 30–34 793 (32.89) 755 (31.25) 1.40 [0.82, 2.40]
 35–39 332 (13.77) 322 (13.33) 1.38 [0.79, 2.39]
 ≥40 146 (6.06) 137 (5.67) 1.42 [0.80, 2.53]
Marital status
 Married 2067 (85.80) 2088 (86.42) Reference 0.56
 Unmarried 342 (14.20) 328 (13.58) 0.92 [0.78, 1.08]
Birth place       
 Shanghai 698 (28.95) 775 (32.08) Reference <10−3
 Outside of Shanghai 1713 (71.05) 1641 (67.92) 1.16 [1.03, 1.31]
Education attainment
 Collage or above 1061 (44.01) 1378 (57.04) Reference <10−3
 High school 314 (13.02) 280 (11.59) 1.46 [1.22, 1.74]
 Middle school 178 (7.38) 195 (8.07) 1.19 [0.95, 1.48]
 Primary school or lower 858 (35.59) 563 (23.30) 1.98 [1.73, 2.26]
Occupation
 Employed 1682 (69.88) 1897 (78.58) Reference <10−3
 Self-employed 262 (10.89) 184 (7.62) 1.61 [1.32, 1.96]
 Unemployed 463 (19.24) 333 (13.80) 1.57 [1.34, 1.83]
Personal annual income (RMB)
 <50,000 1165 (48.32) 1093 (45.24) Reference 0.13
 50,000-100,000 777 (32.23) 841 (34.81) 0.87 [0.76, 0.99]
 > 100,000 469 (19.45) 482 (19.95) 0.91 [0.79, 1.06]
Smokingb
 None smoker 2298 (95.31) 2294 (96.18) Reference 0.41
 Occasional smoker 63 (2.61) 57 (2.39) 1.10 [0.77, 1.59]
 Regular smoker 50 (2.07) 34 (1.43) 1.47 [0.95, 2.28]
Institutionsc
 1 1404 (58.23) 1409 (58.32) Reference 1.00
 2 276 (11.45) 274 (11.34) 1.01 [0.84, 1.21]
 3 291 (12.07) 293 (12.13) 1.00 [0.83, 1.19]
 4 272 (11.28) 272 (11.26) 1.00 [0.84, 1.21]
 5 168 (6.97) 168 (6.95) 1.00 [0.80, 1.26]
  1. EP ectopic pregnancy, IUP intrauterine pregnancy, OR odds ratio, CI confidence interval
  2. aThe sum does not necessarily equal the sample size for all variables because of missing data
  3. bOccasional smoker: cigarette smoking more than 4 times a week, but a day on average less than 1 cigarette. Regular smoker: cigarette smoking more than 1 cigarettes per day, continuous or accumulated 6 months
  4. cCenter 1 = International Peace Maternity and Child Health Hospital; Center 2 = Shanghai First People's Hospital; Center 3 = Songjiang Central Hospital; Center 4 = Songjiang Maternity and Child Health Hospital; Center 5 = Minhang Central Hospital