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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 %)