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Table 3 Association between blood lead concentrations and ADHD

From: Blood lead concentrations and attention deficit hyperactivity disorder in Korean children: a hospital-based case control study

Blood lead concentrations (range, μg/dℓ) Crude OR (95 % CI) p-value Adjusted OR (95 % CI)a p-value
Total concentration (0.18–5.35) 1.69 (1.19–2.41) 0.004 1.60 (1.04–2.45) 0.03
Quartile
 1st (0.18–1.12) Reference   Reference  
 2nd (1.13–1.71) 1.38 (0.65–2.90) 0.40 1.26 (0.56–2.84) 0.39
 3rd (1.72–2.29) 1.20 (0.57–2.52) 0.63 1.26 (0.55–2.87) 0.61
 4th (2.30–5.35) 2.96 (1.38–6.35) 0.005 2.54 (1.09–5.94) 0.03
  1. OR odds ratio, CI confidence interval
  2. aAdjusted for sex, age, gestational age, birth weight, economic status, parental education, and parents’ smoking behavior