Table 2 Univariate logistic regression model of probability of blood lead levels ≥20 μg/L

Sex

boy

126

46.2

1

girl

147

53.8

0.762

0.467–1.243

0.276

Age (years)

1–3

108

39.6

1

4–6

165

60.4

1.348

0.822–2.213

0.237

Body mass index

normal

211

77.3

1

overweight and obese

62

22.7

0.863

0.485–1.534

0.615

One-child Family

yes

225

82.4

1

no

48

17.6

1.091

0.574–2.074

0.791

Passive smoking

yes

174

63.7

1

no

99

36.3

0.758

0.458–1.253

0.280

Social economic status

low

61

22.3

1

above median income

212

77.7

1.008

0.563–1.806

0.978

Maternal education

≤high school

70

25.6

1

college or higher

203

74.4

0.636

0.357–1.132

0.124

Maternal occupation

unemployed

59

21.6

1

factory workers

91

33.3

0.760

0.381–1.516

0.436

service workers

69

25.3

0.618

0.299–1.274

0.192

intellectual

54

19.8

0.640

0.297–1.379

0.640

Paternal occupation

unemployed

15

5.5

1

factory workers

130

47.6

1.067

0.358–3.178

0.908

service workers

94

34.4

1.074

0.353–3.271

0.900

intellectual

34

12.5

0.844

0.246–2.904

0.788

Newly decorated house

yes

22

8.1

1

no

251

91.9

1.323

0.551–3.180

0.532

Hand washing before meals

seldom or not

89

32.6

1

often

184

67.4

0.382

0.218–0.671

0.001