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Table 2 Relationship between different variables and blood lead concentrations of study subjects

From: Blood lead concentration and its associated factors in preschool children in eastern Iran: a cross-sectional study

Variable

Mean ± SD

Median [IQR]

Test result

Gender

 Boy

2.40 ± 2.85

1.90 [1.10–3.20]

z = 0.86

p = 0.39

 Girl

2.58 ± 2.40

1.70 [1.10–2.80]

Age

 ≥ 72 month

3.03 ± 2.28

2.40 [1.10–4.60]

χ2 = 5.58

p = 0.13

 12–24 month

2.86 ± 4.15

1.85 [1.10–2.60]

 24–48 month

2.08 ± 1.34

1.70 [1.10–2.50]

 48–72 month

2.28 ± 2.19

1.70 [1.10–2.80]

Exposure to paint

 Yes

2.92 ± 3.32

2.10 [1.20–3.30]

z = 1.39

p = 0.16

 No

2.39 ± 2.46

1.80 [1.10–2.75]

Exposure to soil

 Yes

2.49 ± 1.61

2.20 [1.10–3.25]

z = 1.02

p = 0.31

 No

2.48 ± 2.75

1.80 [1.10–2.70]

Occupation of father

 Employee

2.18 ± 1.33

1.90 [1.10–2.80]

χ2 = 3.25

p = 0.66

 Martial

2.82 ± 2.10

2.10 [1.10–4.15]

 Laborer

3.20 ± 3.96

1.80 [1.20–3.30]

 Repairman

2.30 ± 1.20

2.25 [1.35–2.97]

 Driver

1.79 ± 0.87

1.70 [1.00–2.30]

 Self-employment

2.42 ± 2.85

1.10 [1.70–1.70]

Education levels of parents

 Primary school

3.04 ± 3.89

1.60 [1.10–3.20]

χ2 = 0.87

p = 0.83

 Middle School

2.46 ± 1.64

2.05 [1.12–3.30]

 Diploma

2.51 ± 2.96

1.80 [1.10–2.75]

 Bachelor

2.16 ± 1.43

1.80 [1.10–2.80]

Occupation of mother

 Housewife

2.45 ± 2.64

1.80 [1.10–2.80]

χ2 = 1.79

p = 0.41

 Employment

2.47 ± 1.61

1.90 [1.12–3.42]

 Self-employment

3.29 ± 4.26

2.05 [1.40–3.32]

Opium use in parents

 Yes

2.43 ± 1.53

2.10 [1.17–3.12]

z = 0.64

p = 0.52

 No

2.48 ± 2.66

1.80 [1.10–2.80]

Cigarette smoking

 Yes

2.49 ± 2.70

1.90 [1.20–3.17]

z = 0.58

p = 0.56

 No

2.32 ± 1.41

1.80 [1.10–2.80]