TABLE 2.

Subgroup analysis of depression for the highest vs. lowest category of dietary vitamin A intake.

Stratification	Number of studies	Pooled RR	95% CI	P-value	Heterogeneity
All studies	4	0.83	0.70, 1.00	P = 0.05	P = 0.49; I2 = 0%
Sex
Male	2	0.77	0.48, 1.24	P = 0.29	P = 0.98; I2 = 0%
Female	3	0.75	0.58, 0.98	P = 0.03	P = 0.65; I2 = 0%
Study design
Cross-sectional	3	0.90	0.72, 1.13	P = 0.38	P = 0.56; I2 = 0%
Cohort	1	0.72	0.53, 0.98	/	/
Adjustment of BMI
Adjusted	2	0.75	0.56, 0.99	P = 0.04	P = 0.81; I2 = 0%
Unadjusted	2	0.91	0.71, 1.15	P = 0.41	P = 0.17; I2 = 48%
Adjustment of energy intake
Adjusted	2	0.70	0.53, 0.92	P = 0.01	P = 0.61; I2 = 0%
Unadjusted	2	0.96	0.75, 1.22	P = 0.74	P = 0.92; I2 = 0%