Table 2.

Distribution of gastric cancer cases and controls^a according to tea-drinking habits, adjusted pooled odds ratios (ORs) and corresponding 95% confidence intervals (CIs) for gastric cancer in the Stomach cancer Pooling (StoP) Project consortium.

	Cases		Controls		OR (95% CI)b
	N	%	N	%
Tea-drinking statusc
Non-regular drinkers	3921	42.4	7271	37.0	1
Regular drinkers	5331	57.6	12,362	63.0	0.91 (0.85, 0.97)
Tea-drinking intensityd
Non-regular drinkers	5804	73.8	12,303	69.4	1
1 cup/day	920	11.7	2198	12.4	1.03 (0.94, 1.12)
2 cups/day	557	7.1	1725	9.7	0.98 (0.88, 1.10)
≥3 cups/day	586	7.4	1507	8.5	0.91 (0.80, 1.03)
p-trend					0.27
Study-specific tea-drinking intensityd
Non-regular drinkers	3529	45.8	7850	45.1	1
Low	2417	31.4	5246	30.1	0.92 (0.85, 0.99)
Moderate	979	12.7	2432	14.0	0.98 (0.89, 1.07)
High	776	10.1	1879	10.8	0.90 (0.80, 1.01)
p-trend					0.10
Temperature of tea drinkinge
Non-tea drinkers	797	40.8	1132	36.5	1
Cold/warm	372	19.0	929	30.0	0.65 (0.53, 0.79)
Hot/very hot	786	40.2	1041	33.6	1.04 (0.88, 1.23)

^aFor some variables, the sum does not add to the total because of missing values in tea-drinking status (104 cases, 408 controls), tea-drinking intensity (218 cases, 886 controls), study-specific tea-drinking intensity (94 cases, 211 controls) and tea-drinking temperature (85 cases, 195 controls).

^bOne-stage pooled ORs were estimated using a mixed-effects model adjusted for sex, age category, social class, smoking status, salt intake, vegetable and fruit intake, alcohol intake and family history of gastric cancer.

^cThe study Greece 2 [23] only provided locally computed estimates and thus was not included in one-stage analyses.

^dInformation on tea-drinking intensity was not available for the studies Greece 1 [24], Russia [29], China 3 [42] and Greece 2 [23].

^eInformation on the temperature of tea drinking was available for the studies China 1 [5], China 2 [41], Russia [29], Iran 1 [40], USA 3 [31] and China 3 [42].