Table 1 Descriptive Statistics of the Early Life Exposures in Mexico to ENvironmental Toxicants (ELEMENT) Analytical Sample
|  | Time 1 N = 250 | Time 2 N = 554 | Time 3 N = 519 |
|---|---|---|---|
Maternal characteristics (at time of child’s birth) | |||
 Years of education, (years) | 11 (2.8) 1 | 10.9 (2.9) 2 | 11 (2.9) 3 |
 Age at childbirth, (years) | 26.8 (5.6) 1 | 26.4 (5.4)3 | 26.4 (5.4) 4 |
 Parity (≥ 2), % | 156 (62.4) 1 | 340 (61.4) 2 | 319 (61.5) 3 |
 Marital Status (married), % | 178 (71.2) 1 | 390 (70.4) 4 | 363 (69.9) 5 |
 Enrolled in calcium supplement study, % | 95 (38.) 1 | 150 (27.1) 2 | 138 (26.6) 3 |
Youth characteristics (at birth) | |||
 Girls, % | 132 (52.8) | 286 (51.62) | 273 (52.6)1 |
 Gestational age, (weeks) | 38.9 (1.5) 6 | 38.8 (1.6) 7 | 38.8 (1.6) 8 |
 Mode of delivery (vaginal delivery), % | 144 (57.6) 9 | 352 (63.54) 5 | 329 (63.4) 7 |
 Breastfeeding duration, (months) | 8.1 (5.9) 1 | 8.0 (6.1) 2 | 8 (6) 3 |
Youth characteristics (at follow-up visit) | |||
 Age, (years) | 10.3 (1.7) | 14.5 (2.1) | 16.4 (2.1) |
 Body mass index, (kg/m2) | 19.4 (3.6) | 21.6 (4.1) | 22.8 (4.5) |
 Pubertal onset, % | 104 (41.6) | 509 (91.88) 10 | 518 (99.8) 1 |
 Total caloric intake, (kcal/day) | 2627.3 (837.8) | 2299.1 (922.4) | 2124.5 (835.7) |
Youth cardiometabolic risk factors | |||
 Waist circumference, (cm) | 70.7 (10.7) | 79.6 (11.4) | 85.5 (11.8) 11 |
 Systolic blood pressure, (mm Hg) | 102.7 (10.2) | 98.7 (9.9) | 101.5 (9.8) 11 |
 Diastolic blood pressure, (mm Hg) | 65.5 (7.3) | 63 (6.9) | 64.1 (7.2) 11 |
 Fasting glucose, (mg/dL) | 87 (9.4) 11 | 77.8 (7.3) 12 | 90.2 (8.4) 13 |
 Fasting TG, (mg/dL) | 87.5 (44.4) 11 | 104 (55.9) 12 | 105.5 (50.1) 13 |
 Fasting HDL-C, (mg/dL) | 58.7 (11.9) 11 | 43.1 (8.6) 12 | 44.7 (9) 13 |
 Fasting insulin, (μIU/mL) | 6.3 (11) 14 | 19.1 (11.8) 12 | 19.2 (12.6) 15 |
 HOMA-IR | 1.6 (3.5) 14 | 3.7 (2.3) 12 | 4.3 (2.9) 15 |
Self-reported assessment | |||
 Daily total sedentary activity, (hours/day) | 5.5 (1.9) | 5.9 (2.3) | 5.4 (2.1) 11 |
 Total metabolic equivalents, (METs/week) | 31.4 (19.8) | 57.2 (39) | 45 (35.2) 11 |
Objective assessment of awake time | |||
 Total time of physical activity, (hours/day) | N/A | 15.3 (0.9) 16 | 15.4 (1.1) 17 |
 Total time of sedentary activity, (hours/day) | N/A | 10 (1.2) 16 | 10.5 (1.3) 17 |
 % of total time spent in sedentary activity | N/A | 65.5 (6.7) 16 | 68.2 (6.7) 17 |
 Number of sedentary bouts, (bout/day) | N/A | 36.7 (9.8) 16 | 40.5 (9.4) 17 |
 Duration of sedentary bouts, (minutes/day) | N/A | 322.7 (104.7) 16 | 374.8 (109.8) 17 |
 Total time of light activity, (hours/day) | N/A | 3.9 (0.7) 16 | 3.8 (0.8) 17 |
 % of total time spent in light activity | N/A | 25.9 (4.3) 16 | 24.5 (4.7) 17 |
 Number of light bouts, (bout/day) | N/A | 0.6 (0.8) 16 | 0.9 (1) 17 |
 Duration of light bouts, (minutes/day) | N/A | 3.89 (5.5) 16 | 5.5 (7) 17 |
 Total time of MVPA activity, (hours/day) | N/A | 1.3 (0.5) 16 | 1.1 (0.4) 17 |
 % of total time spent in MVPA activity | N/A | 8.6 (3.1) 16 | 7.3 (2.7) 17 |
 Number of MVPA bouts, (bout/day) | N/A | 0.2 (0.5) 16 | 0.1 (0.3) 17 |
 Duration of MVPA bouts (minutes/day) | N/A | 1.3 (3.6) 16 | 0.9 (2.3) 17 |