Table 2.

Cumulative incidence rate and characteristics of congenital and infantile cataract according to age definition from birth to 1 year old, 3-year-old, and 5-year-old.

	True congenital and infantile cataract (0–1 year old)	Possible congenital and infantile cataract (0–3 years old)	Probable congenital and infantile cataract (0–5 years old)
Subject birth cohorts	2004–2010	2004–2008	2004–2006
Total population of cohorts	3,245,158	2,330,138	1,367,424
Female population	1,567,378	1,124,610	657,887
Male population	1,677,780	1,205,528	709,537
Total patients of cataract surgery	518	554	403
Female patients	235	251	171
Male patients	283	303	232
Total incidence rate per 10,000 birth (95% CI)	1.60 (1.46–1.73)	2.38 (2.18–2.58)	2.95 (2.66–3.23)
Female incidence rate	1.50 (1.31–1.69)	2.23 (1.96–2.51)	2.60 (2.21–2.99)
Male incidence rate	1.69 (1.49–1.88)	2.51 (2.23–2.80)	3.27 (2.85–3.69)
Laterality
Bilateral cataract	93 (18.0%)	120 (21.7%)	81 (20.1%)
Unilateral cataract	425 (82.0%)	434 (78.3%)	322 (79.9%)
Primary IOL implantation	104 (20.1%)	217 (39.2%)	216 (53.6%)

CI cataract, congenital and infantile cataract, IOL intraocular lens.