Table 1 Characteristics of study subjects according to tertiles (T) of leptin (ng/mL)
| Â | Men | Women | ||||||
|---|---|---|---|---|---|---|---|---|
T1 (low) | T2 | T3 (high) | Trend P a | T1 (low) | T2 | T3 (high) | Trend P a | |
n | 96 | 96 | 95 | Â | 70 | 70 | 70 | Â |
Age (mean ± S.D., year) | 42.7 ± 10.6 | 45.6 ± 11.3 | 45.8 ± 11.1 | 0.049 | 42.3 ± 10.1 | 41.4 ± 10.1 | 44.4 ± 10.2 | 0.24 |
BMI (mean ± S.D., kg/m2) | 21.1 ± 2.3 | 22.8 ± 1.9 | 25.8 ± 3.2 | <0.01 | 19.4 ± 2.8 | 20.9 ± 2.0 | 23.2 ± 2.8 | < 0.01 |
Workplace (A, %)b | 28.1 | 35.4 | 32.6 | 0.50 | 44.3 | 11.4 | 8.6 | < 0.01 |
Married (%) | 75.0 | 84.4 | 80.0 | 0.39 | 72.9 | 54.3 | 72.9 | 0.98 |
Job position (low, %) | 59.4 | 51.0 | 44.2 | 0.04 | 71.4 | 64.3 | 58.6 | 0.11 |
Sedentary work (%) | 89.6 | 86.5 | 93.7 | 0.35 | 64.3 | 74.3 | 67.1 | 0.72 |
Non-job physical activity (≥2 h/week, %)c | 51.0 | 42.7 | 47.4 | 0.61 | 24.3 | 24.3 | 28.6 | 0.56 |
Current smoker (%) | 65.6 | 57.3 | 55.8 | 0.17 | 4.3 | 7.1 | 1.4 | 0.41 |
Current alcohol drinker (%) | 69.8 | 70.8 | 68.4 | 0.84 | 45.7 | 50.0 | 48.6 | 0.74 |
Energy intake (kcal/day) | 1921 ± 539 | 1864 ± 439 | 1983 ± 580 | 0.42 | 1509 ± 383 | 1562 ± 411 | 1679 ± 426 | 0.01 |
Serum folate (ng/mL) median (IQR) | 5.2 (4.3-7.3) | 5.5 (4.3-6.7) | 5.2 (4.1-6.6) | 0.41 | 6.6 (5.6-8.5) | 6.3 (4.9-8.8) | 6.3 (5.7-7.6) | 0.29 |
Serum ferritin (μg/L) median (IQR) | 123.5 (86.0-184.0) | 149.0 (96.6-224.0) | 172.0 (105.0-251.0) | 0.31 | 36.1 (12.7-81.4) | 39.9 (15.8-77.6) | 36.1 (14.1-85.7) | 0.98 |