Table 4

Estimated attack odds ratios for BTS treatment steps 1–5 relative to treatment step 0 by age group with 99% confidence intervals

BTS treatment step		Age group (years)
BTS treatment step		<5	5–15	16–44	45–74	75+
1	Odds ratio	3	4.03^4-150	1.09	0.85	0.61
	99% CI	0.4 to 24	1.03 to 15.7	0.47 to 2.55	0.37 to 1.95	0.1 to 5.6
2	Odds ratio	2.3	6.55^4-150	2.11	1.1	0.75
	99% CI	0.3 to 18	1.72 to 24.9	0.96 to 4.62	0.53 to 2.30	0.1 to 5.2
3	Odds ratio	4.1	5.8^4-150	3.49^4-150	1.23	0.94
	99% CI	0.5 to 32	1.52 to 22.1	1.56 to 7.81	0.58 to 2.60	0.13 to 6.75
4	Odds ratio	5.7	11.2^4-150	5.66^4-150	3.07^4-150	2.16
	99% CI	0.6 to 50	2.9 to 43	2.42 to 13.2	1.45 to 6.50	0.3 to 15.7
5	Odds ratio	3.3	16.2^4-150	14.7^4-150	3.96^4-150	4.9
	99% CI	0 to 221	2.3 to 116	4.5 to 47.8	1.70 to 9.22	0.6 to 39

↵4-150 There is strong evidence that the corresponding odds ratio is different from 1 as the confidence interval does not include 1.