Table 2 Characteristics of the subjects with/without induced abortion, and with/without past-year suicidal ideation (N = 5115)

 Shanghai

344 (43.4%)

1911 (44.2%)

0.337

170 (40.7%)

2085 (44.4%)

0.292

 Beijing

243 (30.7%)

1395 (32.3%)

138 (33.0%)

1500 (31.9%)

 Guangzhou

205 (25.9%)

1017 (23.5%)

110 (26.3%)

1112 (23.7%)

  < 20

52 (6.6%)

444 (10.3%)

0.004

49 (11.7%)

447 (9.5%)

0.220

 20–25

530 (66.9%)

2823 (65.3%)

260 (62.2%)

3093 (65.9%)

  > 25

210 (26.5%)

1056 (24.4%)

109 (26.1%)

1157 (24.6%)

Highest education

 Middle school or below

289 (36.5%)

1176 (27.2%)

< 0.001

155 (37.1%)

1310 (27.9%)

< 0.001

 Senior high school

451 (56.9%)

2782 (64.4%)

230 (55.0%)

3003 (63.9%)

 College degree or above

52 (6.6%)

365 (8.4%)

33 (7.9%)

384 (8.2%)

  < 3200

246 (31.1%)

1623 (37.5%)

< 0.001

168 (40.2%)

1701 (36.2%)

0.236

 3200–4800

506 (63.9%)

2593 (60.0%)

237 (56.7%)

2862 (60.9%)

  > 4800

40 (5.1%)

107 (2.5%)

13 (3.1%)

134 (2.9%)

 Urban

218 (27.5%)

1035 (23.9%)

0.031

91 (21.8%)

1162 (24.7%)

0.176

 Rural

574 (72.5%)

3288 (76.1%)

327 (78.2%)

3535 (75.3%)

  < 1

359 (45.3%)

1878 (43.4%)

0.101

217 (51.9%)

2020 (43.0%)

0.001

 1–5

107 (13.5%)

504 (11.7%)

52 (12.4%)

559 (11.9%)

  > 5

326 (41.2%)

1941 (44.9%)

149 (35.6%)

2118 (45.1%)

 No

726 (91.7%)

4120 (95.3%)

< 0.001

403 (96.4%)

4443 (94.6%)

0.110

 Yes

66 (8.3%)

203 (4.7%)

15 (3.6%)

254 (5.4%)

Alcohol use-past month

 No

557 (70.3%)

3576 (82.7%)

< 0.001

306 (73.2%)

3827 (81.5%)

< 0.001

 Yes

235 (29.7%)

747 (17.3%)

112 (26.8%)

870 (18.5%)

 No

696 (87.9%)

3859 (89.3%)

0.250

345 (82.5%)

4210 (89.6%)

< 0.001

 Yes

96 (12.1%)

464 (10.7%)

73 (17.5%)

487 (10.4%)

Attitude toward premarital pregnancy

 Positive

321 (40.5%)

725 (16.8%)

< 0.001

108 (25.8%)

938 (20.0%)

0.004

 Negative

471 (59.5%)

3598 (83.2%)

310 (74.2%)

3759 (80.0%)

 Positive

47 (5.9%)

109 (2.5%)

< 0.001

23 (5.5%)

133 (2.8%)

0.002

 Negative

745 (94.1%)

4214 (97.5%)

395 (94.5%)

4564 (97.2%)

 High self-esteem (score > =15)

679(85.7%)

3883 (89.8%)

0.017

310(74.2%)

4204(89.5%)

< 0.001

 Low self-esteem (score < 15)

113(14.3%)

440 (10.2%)

108(25.8%)

493(10.5%)

 Low loneliness (score < =17%)

598 (75.5%)

3287 (76.0%)

0.748

196 (46.9%)

3689 (78.5%)

< 0.001

 High loneliness (score > 17)

194 (24.5%)

1036 (24.0%)

222 (53.1%)

1008 (21.5%)

 Non-anxiety group (score < 10)

701 (88.5%)

3805 (88.0%)

0.694

333 (79.7%)

4173 (88.8%)

< 0.001

 Anxiety group (score > =10)

91 (11.5%)

518 (12.0%)

85 (20.3%)

524 (11.2%)

 Non-depression group (score < 20)

494 (62.4%)

2757 (63.8%)

0.451

177 (42.3%)

3074 (65.4%)

< 0.001

 Depression group (score > =20)

298 (37.6%)

1566 (36.2%)

241 (57.7%)

1623 (34.6%)

 No

–

–

–

310 (74.2%)

4013 (85.4%)

< 0.001

 Yes

–

–

108 (25.8%)

684 (14.6%)

 No

684 (86.4%)

4013 (92.8%)

< 0.001

–

–

–

 Yes

108 (13.6%)

310 (7.2%)

–

–