Table 1 Lifestyle variables for the year preceding academy entrance
From: Determinants of bone mass and bone size in a large cohort of physically active young adult men
Variable | Mean ± SD (Caucasians) | Mean ± SD (African Americans) | Mean ± SD (Asians) |
|---|---|---|---|
Age (years) | 18.7 (± 1.05) | 18.5 (± 0.94) | 18.5 (± 0.73) |
Variable | Percentage (n) | Percentage (n) | Percentage (n) |
Exercise (hrs/week) | Â | Â | Â |
   1–3 | 5.5 (36) | 6.3 (4) | 10.5 (4) |
   4–6 | 19.5 (127) | 23.3 (15) | 19.5 (6) |
   7–10 | 30.9 (201) | 28.1 (18) | 30.9 (13) |
   11+ | 44.1 (287) | 42.2 (27) | 44.1(15) |
Milk (glass/day) | Â | Â | Â |
   0 | 4.4 (29) | 4.7 (3) | 7.9 (3) |
   < 1 | 17.0 (111) | 28.1 (18) | 13.2 (5) |
   1–2 | 47.4 (309) | 43.8 (28) | 50.0 (19) |
   3+ | 31.1 (203) | 23.4 (15) | 28.9 (11) |
Caffeinated (Drinks/day) | Â | Â | Â |
   None | 17.1 (111) | 14.3 (9) | 36.8 (14) |
   1–3 | 70.3 (457) | 76.2 (48) | 57.8 (22) |
   3+ | 12.6 (82) | 9.5 (6) | 5.3 (2) |
Alcohol Consumption | Â | Â | Â |
   Less than once a month | 57.8 (375) | 78.1 (50) | 66.7 (22) |
   1–3 times a month | 22.7 (147) | 15.6 (10) | 30.3 (10) |
   1–2 times a week | 14.6 (95) | 4.7 (3) | 9.1 (3) |
   3–5 times a week | 4.0(26) | 1.6(1) | 0.0 (0) |
   daily | 0.9 (6) | 0.0 (0) | 0.0 (0) |
Smokers | 5.1 (41) | 4.7 (3) | 13.1 (5) |