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Table 1 Univariate description of demographic characteristics, bone/blood Pb concentrations, and cortisol sample characteristics of 936 Mexico City pregnant women (2007–2011)

From: Relationships between lead biomarkers and diurnal salivary cortisol indices in pregnant women from Mexico City: a cross-sectional study

Variable N (%) Mean (SD) Min, Max
Maternal Age   27.8 (5.5) 18.0, 44.0
Maternal Education   11.9 (2.9) 0.0, 21.0
Maternal Weight   64.7 (11.0) 40.0, 108.0
Maternal Height   1.6 (0.1) 1.4, 1.8
Maternal BMI (kg/m2)   26.9 (4.2) 17.4, 44.7
Weeks Gestation at Cortisol Collection   19.7 (2.4) 14.1, 35.1
Calf Circumference at 1-Month visit (cm)   33.6 (3.2) 25.0, 47.0
Negative Life Events Score   3.1 (2.1) 0.0, 11.0
Edinburgh Postnatal Depression Scale Score   8.4 (5.6) 0.0, 28.0
Maternal 2nd Trimester Blood Pb Concentration (µg/dL)   3.7 (2.7) 0.5, 23
Maternal Tibia Pb Concentration (µg/g)   2.7 (8.4) ND, 20
Maternal Patella Pb Concentration (µg/g)   4.6 (8.6) ND, 43
Waking Time (SD in minutes)   0747 (83) 0305-1300
Hour of Sleep (hours) 1   8.3 (1.6) 0.0, 14.5
Marital Status    
Married 537 (57.4) 537 (57.4)  
Free Union 226 (24.1) 226 (24.1)  
Single/Divorced/Separated 173 (18.5) 173 (18.5)  
Number of prior children    
1 356 (38.0) 356 (38.0)  
2 339 (36.2) 339 (36.2)  
3 175 (18.7) 175 (18.7)  
4+ 66 (7.1) 66 (7.1)  
Smoking Status During Pregnancy    
Never 614 (65.6) 614 (65.6)  
Former 316 (33.8) 316 (33.8)  
Current 6 (0.6) 6 (0.6)  
Weekday Cortisol Collection1    
No 333 (35.6) 333 (35.6)  
Yes 603 (64.4) 603 (64.4)  
  1. ND: Not detectable.
  2. 1-On first day of collection.