Table 3.

Summary of the social contact scores for each distance level for cases and controls

Social contacts	Group	n	Mean	s.d.*	Min	Max	OR* (95% CI)	P value
In the home: level 1	Control	199	19·5	3·5	6	30
(max. possible score = 42)	Case	90	20·5	3·1	14	31	1·09 (1·01–1·18)	P = 0·024
Within the neighbourhood: level 2	Control	199	20·6	7·3	0	39
(max. possible score = 57)	Case	90	24·1	6·8	8	37	1·07 (1·03–1·11)	P < 0·001
Outside the neighbourhood: level 3	Control	199	7·1	3·1	0	16
(max. possible score = 26)	Case	90	7·6	3·1	1	15	1·05 (0·97–1·16)	P = 0·266

OR, Odds ratio; CI, confidence interval; s.d., standard deviation.

^*Univariate logistic regression.