Table 3.

ONFH incident rates pre- and post-HU era

Age category (y)	Pre-HU (1991-2000)			Post-HU (2001-2013)
	ONFH cases	Incident rate*	95% CI	ONFH cases	Incident rate*	95% CI
<10	46	0.85	0.63, 1.10	31	0.46	0.32, 0.64
10 to <20	137	2.65	2.23, 3.12	145	1.27	1.07, 1.49
20 to <30	151	2.52	1.93, 2.70	236	2.11	1.86, 2.40
30 to <40	133	2.48	2.08, 2.93	158	1.66	1.42, 1.93
40 to <50	73	2.58	2.04, 3.23	110	1.44	1.19, 1.73
50 to <60	38	4.43	3.18, 6.02	69	1.78	1.39, 2.23
≥60	10	6.51	3.31, 11.6	19	1.94	1.21, 2.98
Total	588	2.37	2.18, 2.56	768	1.52	1.41, 1.63

Reprinted from Adesina et al⁸ with permission.

^*Incident rate per 100 person-years.