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Table 1 Characteristics of the study cohort compared to the parent PROGRESS cohort and the general Mexican population

From: Toddler temperament and prenatal exposure to lead and maternal depression

Participant Characteristics

Mexican population [44]

Selected study cohort (n = 500)

PROGRESS families not in the selected cohort (n = 260)

Continuous variables

   

Maternal age (years)

 

26.9 ± 5.5

27.3 ± 5.3

Maternal 2nd trimester blood Pb, (median (IQR), ug/dL)

 

2.8 (2.7)

2.8 (2.4)

Maternal postpartum tibia Pb (mean ± SD, ug/g bone mineral)

 

2.6 ± 8.6

2.7 ± 8.3

Maternal postpartum patella Pb (mean ± SD, ug/g bone mineral)

 

4.9 ± 8.9

4.3 ± 8.0

Maternal EPDS score, 2nd or 3rd trimester (mean ± SD)

 

8.3 ± 5.7

8.9 ± 6.0

Categorical variables

   

Maternal education

   

 More than high school

 

117 (23.4 %)

60 (23.1 %)

 High school

 

171 (34.2 %)

104 (40.0 %)

 Less than high school

 

212 (42.4 %)

96 (36.9 %)

Socioeconomic index

   

 High

21.2 %

46 (9.2 %)

33 (12.7 %)

 Middle

53.7 %

177 (35.4 %)

105 (40.4 %)

 Low

25 %

277 (55.4 %)

122 (46.9 %)