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Table 3 General information and blood lead levels of the exposed subjects and control groupa

From: The relationship between blood lead levels and occupational exposure in a pregnant population

Variable Exposed group (n = 31) Control group (n = 268) p value*
Age (years) 26.03 (6.17) 24.13 (6.76) 0.135
Gestational age (weeks) 22.71 (8.06) 24.22 (8.75) 0.358
Number of pregnancies 2.55 (1.38) 2.23 (1.47) 0.253
Body mass index (kg/m2) 28.81 (4.79) 27.04 (5.70) 0.098
Hemoglobin (g/dL) 12.97 (1.11) 12.50 (1.36) 0.065
Monthly income per person, USD 165.62 (130.59) 138.00 (146.28) 0.316
Blood lead levels (μg/dL) 4.00 (4.08) 2.65 (1.75) 0.002**
  1. aValues shown as mean (standard deviation)
  2. *p value was calculated from Student t-test
  3. **p value from Log BLL