Table 2. Age-specific rates (per 1,000) of spontaneous abortion and menstrual aberration by group, based on aggregated data from 2008–2012.

Age	Group		Number of individuals	Spontaneous abortion (SA)		Menstrual aberration (MA)
				Number of cases	Rate per 1,000 (95% CI)	Number of cases	Rate per 1,000 (95% CI)
20~29	Exposed	Microelectronics workers	1,48,247	331	2.23(2.01-2.49)	13,130	88.57(87.07-90.1)
	Control groups	Dependents of employment-based NHI	53,52,347	7,485	1.4(1.37-1.43)	3,07,534	57.46(57.26-57.66)
		Holders of employment-based NHI	61,73,723	9,861	1.6(1.57-1.63)	3,95,786	64.11(63.91-64.31)
		Bank workers	45,199	89	1.97(1.6-2.42)	2,697	59.67(57.46-61.96)
30~39	Exposed	Microelectronics workers	45,865	167	3.64(3.13-4.24)	2,474	53.94(51.86-56.11)
	Control groups	Dependents of employment-based NHI	67,16,802	15,470	2.3(2.27-2.34)	2,89,943	43.17(43.01-43.32)
		Holders of employment-based NHI	61,95,965	13,498	2.18(2.14-2.22)	2,47,007	39.87(39.71-40.02)
		Bank workers	60,102	160	2.66(2.28-3.11)	2,647	44.04(42.4-45.75)