Table 2.
Associations between dietary total antioxidant capacity (TAC) and the risk of osteoporosis in the study population.
| Variables | Quartiles of Dietary TAC (mg VCE/day) | p-Value | |||
|---|---|---|---|---|---|
| Q1 | Q2 | Q3 | Q4 | ||
| Postmenopausal women, n (osteoporosis %) | 890 (47.0) | 890 (37.5) | 890 (33.4) | 889 (28.1) | |
| Cut off (mg VCE/day) | <150.96 | 150.96 ≤ to < 267.65 | 267.65 ≤ to < 456.89 | ≥456.89 | |
| Median dietary TAC (mg VCE/day) | 93.48 | 208.26 | 347.32 | 643.52 | |
| Unadjusted OR (95% CI) | 1 | 0.673 (0.525–0.863) | 0.618 (0.486–0.787) | 0.398 (0.315–0.504) | <0.001 |
| Adjusted OR (95% CI) | 1 | 0.952 (0.715–0.268) | 1.066 (0.805–1.410) | 0.732 (0.540–0.992) | 0.045 |
| Premenopausal women, n (osteoporosis %) | 1167 (1.7) | 1168 (1.0) | 1168 (1.4) | 1168 (1.5) | |
| Cut off (mg VCE/day) | <169.28 | 169.28 ≤ to < 286.79 | 286.79 ≤ to < 474.48 | ≥474.48 | |
| Median dietary TAC (mg VCE/day) | 109.36 | 226.41 | 361.06 | 666.44 | |
| Unadjusted OR (95% CI) | 1 | 0.515 (0.216–1.228) | 0.708 (0.337–1.487) | 1.056 (0.489–2.283) | 0.590 |
| Adjusted OR (95% CI) | 1 | 0.554 (0.232–1.318) | 0.825 (0.395–1.723) | 1.220 (0.555–2.681) | 0.394 |
Odds ratios (ORs) and 95% confidence intervals (CIs) are presented. The logistic regression model was adjusted for age, waist circumference, energy intake, sodium intake, smoking status, and regular exercise for postmenopausal women, and adjusted for waist circumference and 25(OH)D levels for premenopausal women. VCE, vitamin C equivalents.