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Table 2 Categorical analyses of the change on total diurnal infant (ln) cortisol level stratified by infant age group

From: Longitudinal associations of age and prenatal lead exposure on cortisol secretion of 12–24 month-old infants from Mexico City

  Lower Lead (<5 μg/dL) Moderate Lead (5 ≤ Pb < 10 μg/dL) Higher Lead (≥10 μg/dL)
   β % change β % change
12-Month Infants a
 2nd trimester Ref −0.07 (−0.24, 0.10) −7 (−22, 10) −0.51 (−0.85, −0.18)* −40 (−57, −16)*
 3rd trimester Ref −0.14 (−0.31, 0.03) −13 (−27, 3) −0.02 (−0.31, 0.26) −2 (−26, 30)
 Tibiac Ref 0.02 (−0.14, 0.19) 2 (−13, 20) −0.03 (−0.21, 0.14) −3 (−19, 15)
18- & 24-Month Infants b
 Second Trimester Ref 0.11 (−0.08, 0.30) 12 (−8, 35) 0.23 (−0.19, 0.65) 26 (−18, 92)
 Third Trimester Ref 0.01 (−0.17, 0.20) 1 (−16, 22) −0.05 (−0.51, 0.41) −5 (−40, 51)
 Tibia Ref 0.10 (−0.13, 0.32) 10 (−12, 38) 0.14 (−0.08, 0.35) 14 (−8, 42)
  1. Effect estimates: β (95 % CI), % change and (95 % CI). All models are adjusted for child’s gender and maternal age at delivery, pre-pregnancy BMI and total school years
  2. a n = 255
  3. b n = 150
  4. ctertiles were used for tibia bone (μg/g)
  5. *p < 0.05, remained significant (p < 0.025) after Bonferroni correction for multiple comparisons