Table 1. Annual numbers and rates per 1,000 for spontaneous abortion and menstrual aberration according to patient group, 2008–2012.

Group		Year	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)
Exposed group	Microelectronics workers	2008	39,388	82	2.08(1.68-2.59)	3,122	79.26(76.53-82.09)
		2009	37,816	88	2.33(1.89-2.87)	3,090	81.71(78.88-84.64)
		2010	39,838	87	2.18(1.77-2.7)	3,015	75.68(73.03-78.43)
		2011	40,902	131	3.2(2.7-3.8)	3,460	84.59(81.82-87.46)
		2012	36,168	110	3.04(2.52-3.67)	2,917	80.65(77.78-83.63)
Control groups	Dependents of employment-based NHI	2008	24,82,176	4,764	1.92(1.87-1.98)	1,21,808	49.07(48.8-49.35)
		2009	24,25,842	4,481	1.85(1.79-1.9)	1,19,399	49.22(48.94-49.5)
		2010	24,25,030	4,275	1.76(1.71-1.82)	1,15,403	47.59(47.31-47.86)
		2011	23,70,691	4,235	1.79(1.73-1.84)	1,17,619	49.61(49.33-49.9)
		2012	23,65,410	5,200	2.2(2.14-2.26)	1,23,248	52.1(51.81-52.4)
	Holders of employment-based NHI	2008	23,66,827	4,561	1.93(1.87-1.98)	1,20,925	51.09(50.8-51.38)
		2009	24,21,571	4,160	1.72(1.67-1.77)	1,19,685	49.42(49.15-49.71)
		2010	24,74,351	4,502	1.82(1.77-1.87)	1,25,032	50.53(50.25-50.81)
		2011	25,31,671	4,565	1.8(1.75-1.86)	1,32,556	52.36(52.08-52.64)
		2012	25,75,268	5,571	2.16(2.11-2.22)	1,44,595	56.15(55.86-56.44)
	Bank workers	2008	24,194	48	1.98(1.5-2.63)	1,073	44.35(41.77-47.08)
		2009	22,155	49	2.21(1.67-2.93)	1,116	50.37(47.5-53.42)
		2010	20,405	40	1.96(1.44-2.67)	1,095	53.66(50.58-56.94)
		2011	19,602	57	2.91(2.24-3.77)	990	50.51(47.46-53.75)
		2012	18,945	55	2.9(2.23-3.78)	1,070	56.48(53.19-59.97)