Table 5.

Association with Dietary Vitamin C and Cataract

Dietary Vitamin C (mg/day)	OR (95% CI)⁎	OR (95% CI)†
Q1: 10.8 (8.0–13.1)‡	1	1
Q2: 19.6 (17.6–21.7)‡	0.83 (0.64–1.08)	0.85 (0.65–1.11)
Q3: 28.6 (26.0–31.2)‡	0.87 (0.67–1.13)	0.90 (0.69–1.17)
Q4: 40.2 (36.8–44.0)‡	0.71 (0.53–0.94)	0.74 (0.57–0.96)
Q5: 66.4 (55.8–83.9) ‡	0.72 (0.58–0.90)	0.78 (0.62–0.98)
P trend§	0.001	0.006
P interaction∥	0.7	0.8

CI = confidence interval; OR = odds ratio.

^⁎Adjusted for age, sex, dietary energy intake, study center.

^†Adjusted for age, sex, dietary energy intake, study center, tobacco use, current fuels, BMI, diastolic blood pressure, outdoor exposure, diabetes, and socioeconomic status.

^‡Median (interquartile range).

^§Test for trend by design-adjusted Wald test with 4 ordered categories of antioxidant entered as independent continuous variable.

^∥Test for interaction of dietary vitamin C and study center by design-adjusted chi-square test.