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Table 1 Characteristics of pregnant women, China, 2015 (n, %)

From: Smoking in pregnancy: a cross-sectional study in China

Variable

All participants

Smoker

Non-smoker

Hospital level

 Level 3A hospital

1824(77.8)

1752(77.7)

72(80.0)

 Level 2 A hospitals

311(13.3)

301(13.4)

10(11.1)

 Level 2B hospitals and below

210(9.0)

202(8.9)

8(8.9)

Parity

 Pregnant women in their first pregnancy

1755(74.8)

67(74.4)

1688(74.9)

 Pregnant women s in their second pregnancy

590(25.2)

23(25.6)

567(25.1)

Nationality

 Han nationality

2252(96.0)

88(97. 8)

2164(96.0)

 Minority

93(4.0)

2(2.2)

91(4.0)

Single-child

 Yes

1046(44.6)

36(40.0)

1010(44.8)

 No

1299(55.4)

54(60.0)

1245(55.2)

Husband was single-child

 Yes

1173(50.0)

43(47.8)

1130(50.1)

 No

1172(50.0)

47(52.2)

1125(49.9)

Marital status

 Unmarried

49(2.1)

4(4.4)

45(2.0)

 Married

2205(94.0)

81(90.0)

2124(94.2)

 Remarried

70(3.0)

4(4.4)

66(2.9)

 Divorced or Widowed

21(0.9)

1(1.2)

20(0.9)

Education level

 Basic education

402(17.1)

5(5.6)

397(17.6)

 Secondary education

354(15.1)

11(12.2)

343(15.2)

 Higher education

1589(67.8)

74(82.2)

1515(67.2)

Residence

 Urban

1880(80.2)

69(76.7)

1811(80.3)

 Rural

465(19.8)

21(23.3)

444(19.7)

The per capita income of the family

  < 4500¥

611(26.0)

25(27.8)

586(26.0)

 4500¥ to 9000 ¥

989(42.2)

33(36.7)

956(42.4)

  > 9000¥

745(31.8)

32(35.5)

713(31.6)

Trimester of pregnancy

 First trimester

293(12.5)

14(15.6)

279(12.4)

 Second trimester

701(29.9)

30(33.3)

671(29.8)

 Third trimester

1351(57.6)

46(51.1)

1305(57.8)

Age

 18–25 years old

624 (26.6)

19(21.1)

605(26.8)

 26–35 years old

1595(68.0)

67(74.4)

1528(67.8)

 36–45 years old

126(5.4)

4(4.5)

122(5.4)

Occupation

 Rural migrant workers

118(5.0)

2(2.2)

116(5.1)

 Urban and rural unemployed

553(23.6)

18(20.0)

535(23.7)

 Industrial workers of Non-agricultural registered permanent residence

50(2.1)

3(3.3)

47(2.1)

 Individual business

199(8.5)

9(10.0)

190(8.4)

 Business services staff

155(6.6)

10(11.1)

145(6.4)

 Civil servants

398(17.0)

16(17.8)

382(17.0)

 Senior manager and Middle-level manager in large and medium enterprise

96(4.1)

4(4.5)

92(4.1)

 Private entrepreneur

87(3.7)

2(2.2)

85(3.8)

 Professionals

244(10.4)

9(10.0)

235(10.4)

 Clerk

139(5.9)

5(5.6)

134(5.9)

 Students

15(0.6)

0(0.0)

15(0.7)

 Other

291(12.4)

12(13.3)

279(12.4)

Smoking status of peers of pregnant women

Husband

   

 Smoker

939(40.0)

38(42.2)

901(40.0)

 Non-smoker

1406(60.0)

52(57.8)

1354(60.0)

 Father-in-law

   

 Smoker

719(30.7)

26(28.9)

693(30.7)

 Non-smoker

1626(69.3)

64(71.1)

1562(69.3)

Mother-in-law

   

 Smoker

42(1.8)

6(0.3)

36(1.6)

 Non-smoker

2303(98.2)

36(1.6)

2219(98.4)

Father

   

 Smoker

700(29.8)

27(30)

673(29.8)

 Non-smoker

1645(70.2)

63(70)

1582(70.2)

Mother

   

 Smoker

18(0.8)

1(1.1)

17(0.7)

 Non-smoker

2327(99.2)

89(98.9)

2238(99.3)

Colleague

   

 Smoker

736(31.4)

24(26.7)

712(31.6)

 Non-smoker

1609(68.6)

66(73.3)

1543(68.4)

Friend

   

 Smoker

732(31.2)

26(28.9)

706(31.3)

 Non-smoker

1613(68.8)

64(71.1)

1549(68.7)

Relative

   

 Smoker

625(26.6)

21(23.3)

604(26.8)

 Non-smoker

1720(73.4)

69(76.7)

1651(73.2)