Table 3.

Failure Rates by Body Mass Index Class

	Year 1			Year 2			Year 3
BMI	n	Rate %	95% CI	n	Rate %	95% CI	n	Rate %	95% CI
Lower than 25	48	4.51	(3.4–6.0)	9	6.85	(5.1–9.2)	3	8.44	(6.1, 11.5)
25–30	33	6.63	(4.7–9.4)	5	8.87	(6.3,12.4)	2	11.03	(7.5, 16.0)
30 or higher	18	4.80	(4.0,5.9)	9	7.90	(6.4,9.4)	1	8.92	(7.6, 11.5)
30–40	17	3.69	(2.3, 6.0)	6	7.36	(4.6, 11.6)	1	8.61	(5.3, 13.9)
40 or higher	1	0.53	(0.08, 3.7)	3	10.84	(3.8, 29.1)	0	10.84	(3.8, 29.1)

BMI, body mass index; n, number of failures per BMI class per year; CI, confidence interval.