Table 2 Univariate analysis of low risk group compared with medium risk group, with high risk group[N(%)]

Level of education

8.47/.014

7.177/.028

 Secondary school and below

108(58.1)

78(41.9)

22(22)

78(78)

 University and above

422(57.7)

310(42.3)

47(86.8)

310(13.2)

 Others(specialist, etc.)

42(77.8)

12(22.2)

5(29.4)

12(70.6)

Marital status

.402/.526

1/1

 Married

565(58.7)

398(41.3)

73(15.5)

398(84.5)

 Unmarried/Divorced/Widowed

8(72.7)

3(27.3)

1(25)

3(75)

Personal work

2.69/.26

2.53/.283

 Full-time

437(57.9)

318(42.1)

54

318

 Part-time

19(55.9)

15(44.1)

2

15

 No work

119(59)

66(41)

18

66

Family income(yuan/per person/month)

2.05/.561

2.29/.514

  < 2000

75(60.5)

49(39.5)

11(18.3)

49(81.7)

 2001–3000

89(59.7)

60(40.3)

15(20)

60(80)

 3001–4000

118(62.4)

71(37.6)

12(14.5)

71(85.5)

  > 4000

284(56.8)

216(43.2)

34(13.6)

216(86.4)

History of childbirth

1.13/.287

.007/.935

 No

528(58.5)

374(41.5)

69(15.6)

374(84.4)

 Yes

48(64.9)

26(35.1)

5(16.1)

26(83.9)

Planned pregnancy

7.77/.021

4.15/.126

 Planned pregnancy

411(56.6)

315(43.4)

50(13.7)

315(86.3)

 Unplanned pregnancy

149(64.8)

81(35.2)

23(22.1)

81(77.9)

 others

14(77.8)

4(22.2)

1(20)

4(80)

Pregnancy thoughts

7.49/.024

7.64/.022

 Mission

44(66.7)

22(33.3)

11(33.3)

22(66.7)

 Burden

34(75.6)

11(24.4)

2(15.4)

11(84.6)

 Happy thing

494(57.5)

365(42.5)

57(13.5)

365(86.5)

The relationship with parents-in-law

16.33/0

23.19/0

 Good

473(56.4)

366(43.6)

53(37.5)

366(62.5)

 General /bad

103(74.6)

35(25.4)

21(12.6)

35(87.4)

The marital relationship

15.59/0

31.33/0

 Good

531(57.5)

393(42.5)

62(13.6)

393(86.4)

 General /bad

45(84.9)

8(15.1)

12(60)

8(40)

The father desired sex of the baby (male)

.002/.961

3.63/.057

 Yes

58(59.2)

40(40.8)

13(24.5)

40(75.5)

 No

518(58.9)

361(41.1)

61(14.5)

361(85.5)

Recent major negative life events

9.02/.003

22.63/0

 Yes

41(78.8)

11(21.2)

10(47.6)

11(52.4)

 No

534(57.8)

390(42.2)

63(13.9)

301(86.1)

Medical history

7.34/.007

6.32/.012

 Yes

356(62.6)

213(37.4)

51(19.3)

213(80.7)

 No

220(53.9)

188(46.1)

23(10.9)

188(89.1)

Pregnancy complications

4.92/.027

5.36/.021

 Yes

323(62.2)

196(37.8)

47(19.3)

196(80.7)

 No

253(55.2)

205(44.8)

27(11.6)

205(88.4)

Fear about dystocia

19.31/0

19.83/0

 Yes

260(67.5)

125(32.5)

43(25.6)

125(74.4)

 No

316(53.4)

276(46.6)

31(10.1)

276(89.9)