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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