Table 1.
Selected characteristics and exposures for BetaGene study participants at the time of intravenous glucose tolerance tests (n=1173)
| Variable | n | Mean | Median | Inter-quartile Range |
|---|---|---|---|---|
| Age (yrs) | 1173 | 34.4 | 34.2 | (29 – 39.1) |
| Height (cm) | 1173 | 160.66 | 160.00 | (155 – 166) |
| Weight (kg) | 1173 | 76.27 | 73.70 | (64.5 – 85.7) |
| Body mass index (BMI kg/m ) | 1173 | 29.51 | 28.70 | (25.4 – 32.6) |
| Percent body fat (%) | 1173 | 34.51 | 35.80 | (28.5 – 40.6) |
| Waist-to-hip ratio×100 | 1152 | 88.50 | 88.00 | (84 – 93) |
| Average weekly total physical activity in past 1 year (mins/week) | 1126 | 361.3 | 139.2 | (32.1 – 460.5) |
| Moderate activity (mins/week) | 1138 | 201.8 | 32.1 | (0 – 214.2) |
| Vigorous activity (mins/week) | 1126 | 157.6 | 32.1 | (0 – 214.2) |
| Average daily Calcium intake in past 1 year (mg/day)a | 1133 | 922.5 | 917.3 | (679.4 – 1269.6) |
| Average daily Vitamin D intake in past 1 year (IU/day)a | 1133 | 219.6 | 215.7 | (134.4 – 386.6) |
| Total body BMD (g/cm2 × 100) | 1173 | 110.12 | 109.44 | (103.81 – 115.78) |
| Pelvic BMD (g/cm2 × 100) | 1173 | 124.15 | 123.43 | (114.46 – 132.37) |
| Residential distance from the nearest freeway (m) a | 1137 | 1149 | 1296 | (593 – 2342) |
| Residential distance from the nearest major road (m) a | 1137 | 174.39 | 191.76 | (105.78 – 358.51) |
| Annual average nitrogen dioxide (NO2, ppb) | 1163 | 25.64 | 26.08 | (20.72 – 30.76) |
| Annual average eight-hour ozone (O3, ppb) | 1167 | 40.65 | 39.61 | (36.29 – 45.84) |
| Annual average fine particulate pollution (PM25, μg/m ) | 1164 | 17.42 | 17.36 | (15.29 – 20.36) |
a
Variables are log transformed for the data analysis, and are presented as geometric means.