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Table 1 Blood lead levels of children and the social-demographic characteristics

From: Environmental injustice and childhood lead exposure in peri-urban (ger) areas of Darkhan and Erdenet, Mongolia

Characteristics N Mean (SD, 95% CI) Median (min. max) P-value % children with BLL ≥5 μg/dL
Total   338 3.85 (2.58, 3.6 4.16) 3.6 (<LOD,17.2)a   27.8 (94)
Gender Boys 165 4.47 (2.99, 4.02 4.94) 4.1 (<LOD, 17.2) 0.001 35.7 (60)
Girls 173 3.25 (1.94, 2.98 3.63) 3.3 (<LOD, 13.8) 20.0 (34)
Age(years) 4 93 3.73 (2.61, 3.22 4.29) 3.3 (<LOD, 17.2) 0.725 25.8 (24)
5 84 3.96 (2.39, 3.49 4.68) 3.8 (<LOD, 16.4) 28.6 (24)
6 72 4.03 (2.92, 3.34 4.71) 3.5 (<LOD,14.5) 27.8 (20)
7 89 3.71 (2.43, 3.19 4.22) 3.3 (<LOD,13.8) 29.2 (26)
City Darkhan 167 3.41 (2.15, 3.12 3.84) 3.3 (<LOD, 13.8) 0.032 22.2 (37)
Erdenet 171 4.27 (2.88, 3.84 4.71) 3.8 (<LOD,17.2) 33.3 (57)
House type Apartment 121 3.23 (2.36) 1.65 (<LOD,17.2) 0.0008 19.5 (23)
Ger (tent) 217 4.18 (2.76) 3.9 (<LOD,16.4) 32.3 (71)
Parental education level Primary 11 6.14 (2.44, 4.5 7.78) 5.7 (<LOD, 11.8) < 0.0001 18.2 (2)
Middle school 59 4.92 (3.72, 3.95 5.89) 4.0 (<LOD, 16.4) 36.2 (21)
High school 106 3.97 (2.46, 3.50 4.45) 3.7 (<LOD, 13.8) 27.4 (29)
College 30 3.5 (1.77, 2.83 4.16) 3.4 (<LOD, 7.0) 30.0 (9)
Bachelor degree 129 3.24 (2.18, 2.86 3.62) 1.65 (<LOD,17.2) 20.0 (26)
Parents have a paying job Yes 159 3.38 (2.12, 3.05 3.72) 3.3 (<LOD, 17.2) 0.0004 22.6 (36)
No 174 4.40 (2.66, 3.95 4.85) 4.0 (16.4) 33.3 (58)
  1. a: LOD is limit of detection