Table 1.

Risk factor analysis of exposure and illness

Risk factor	Exposed					Not exposed				RR	95% CI	P	aOR	s.e.	P	95% CI
	N	n	Ill	AR (%)	95% CI	n	Ill	AR (%)	95% CI
Training 6 Sept. 2010	101	51	35	68·6	55·0–79·7	50	13	26	15·9–39·6	2·64	1·60–4·37	<0·0001	—	—	—	—
Training 8 Sept. 2010	101	25	15	60	40·7–76·6	76	33	43·4	32·9–54·6	1·38	0·92–2·08	0·1499	—	—	—	—
Training 10 Sept. 2010	101	55	24	43·6	31·4–56·7	46	24	52·2	38·1–65·9	0·84	0·56–1·26	0·3922	—	—	—	—
Training 11 Sept. 2010	101	19	12	63·2	41·0–80·9	82	36	43·9	33·7–54·7	1·44	0·94–2·19	0·1299	—	—	—	—
Training 13 Sept. 2010	101	56	41	73·2	60·4–83·0	45	7	15·6	7·7–28·8	4·71	2·34–9·47	<0·0001	28·14	18·03	0	8·02–98·77
Training 15 Sept. 2010	101	19	11	57·9	36·3–76·9	82	37	45·1	34·8–55·9	1·28	0·82–2·02	0·3151	—	—	—	—
Training 17 Sept. 2010	101	49	16	32·7	21·2–46·6	52	32	61·5	48·0–73·5	0·53	0·34–0·84	0·0037	—	—	—	—
Training 18 Sept. 2010	101	15	8	53·3	30·1–75·2	86	40	46·5	36·3–57·0	1·15	0·68–1·94	0·6254	—	—	—	—
Gala 5 Sept. 2010	101	18	12	66·7	43·7–83·7	83	36	43·4	33·2–54·1	1·54	1·02–2·31	0·0728	—	—	—	—
Gala 6 Sept. 2010	101	7	6	85·7	48·7–97·4	94	42	44·7	35·0–54·7	1·92	1·32–2·80	0·0511	37·89	54·98	0·012	2·21–650·94
Gala 11 Sept. 2010	101	5	3	60	23·1–88·2	96	45	46·9	37·2–56·8	1·28	0·61–2·70	0·6664	—	—	—	—
Gala 12 Sept. 2010	101	3	2	66·7	20·8–93·9	98	46	46·9	37·4–56·7	1·42	0·62–3·25	0·6031	—	—	—	—
Gala 17 Sept. 2010	101	19	12	63·2	41·0–80·9	82	36	43·9	33·7–54·7	1·44	0·94–2·19	0·1299	—	—	—	—

AR, Attack rate; CI, confidence interval; RR, relative risk; OR, odds ratio.