Table 3.

Odds ratios and 95% confidence intervals of BD scores according to different black tea consumption and caffeine intake levels

Black Tea Consumption	< 1 cup n:23a/20b		1–2 cup n:73a/28b		2–3 cup n:68a/25b		3–4 cup	n:78a/26b	> 4 cup n:101a/49b
	OR	95% CI	OR	95% CI	OR	95% CI	OR	95% CI	OR	95% CI	p value
Model 1	ref	ref	0.44	0.21 – 0.93	0.41	0.19 – 0.88	0.39	0.18 – 0.82	0.55	0.28 – 1.11	0.041
Model 2	ref	ref	0.44	0.20 – 0.93	0.40	0.18 – 0.86	0.42	0.20 – 0.91	0.59	0.29 – 1.20	0.003
Model 3	ref	ref	0.44	0.20 – 0.95	0.42	0.19 – 0.93	0.45	0.21 – 0.98	0.59	0.28 – 1.21	0.000
Caffeine intake	< 300 mg n: 58a/38b		300–450mg n:64a/26b		450–600mg n:77a/20b		600–750mg n:48a/18b		>750mg n:96a/46b
	OR	95% CI	OR	95% CI	OR	95% CI	OR	95% CI	OR	95% CI	p value
Model 1	ref	ref	0.68	0.36 – 1.26	0.40	0.21 – 0.77	0.61	0.31 – 1.21	0.74	0.43 – 1.28	0.003
Model 2	ref	ref	0.64	0.34 – 1.20	0.42	0.22 – 0.82	0.70	0.35 – 1.40	0.80	0.46 -1.40	0.003
Model 3	ref	ref	0.57	0.30 – 1.09	0.39	0.20 – 0.77	0.64	0.31 – 1.31	0.71	0.40 – 1.27	0.000
Model 4	ref	ref	0.56	0.29 – 1.07	0.40	0.20 – 0.78	0.66	0.32 – 1.38	0.81	0.44 – 1.49	0.000

Model 1: Sex, age, BMI; Model 2: Model 1 + education level, marital status, income; Model 3: Model 2 + smoking status, alcohol consumption, regular physical activity, diastolic and systolic blood pressure; Model 4: Model 3 + Caffeine intake other than black tea

^aBDI score<10

^bBDI score≥10

1 cup: 200 mL