Table 4a. Incidence of serious eye injuries in 2009 compared with that in 1992.

	1-year cumulative incidence of ocular trauma per 100 000
	1992	2009	Incidence ratio: 1992/2009 (95% CI)	Homogeneity test P-value*
Males
Crude estimates	13.73	3.46	3.97 (3.13–5.02)
Age-adjusted estimates			3.77 (2.97–4.77)	0.234
Females
Crude estimates	2.54	0.56	4.54 (2.59–7.94)
Age-adjusted estimates			4.57 (2.55–8.17)	0.295
Males and females
Crude estimates	8.14	1.96	4.04 (3.25–5.02)
Age- and sex-adjusted estimates			3.88 (3.12–4.83)	0.328

*Tests the hypothesis that there is homogeneity of incidence ratios across the strata of the adjustment variable(s).