Pregnancy loss and Income in the Republic of Korea using National Health Insurance Service Data, 2008–2014

BMC Public Health

Table 2 The average annual prevalence of pregnancy loss and prevalence ratio according to age and income levels from 2008 to 2014

	N	P	PR	95% CI		adj.PR^a	95% CI
Age (years)
20 ~ 24	33,570	11.9	1.09	1.08	1.11	1.08	1.06	1.10
25 ~ 29	155,029	10.8	Ref.			Ref.
30 ~ 34	226,612	13.9	1.28	1.27	1.29	1.28	1.27	1.29
35 ~ 39	126,951	25.3	2.34	2.32	2.36	2.31	2.28	2.33
40 ~ 44	44,948	54.2	5.01	4.94	5.08	4.84	4.77	4.91
45 ~ 49	4017	85.1	7.86	7.55	8.20	7.54	7.24	7.86
Income^b
Q0 (lowest)	6608	22.7	1.59	1.54	1.64	1.41	1.36	1.45
Q1	109,689	15.4	1.07	1.06	1.08	1.11	1.10	1.12
Q2	156,313	14.2	0.99	0.98	1.00	1.05	1.04	1.06
Q3	195,059	14.3	Ref.			Ref.
Q4 (highest)	123,458	16.9	1.18	1.17	1.19	1.06	1.05	1.07

N: Number, P: Annual specific prevalence for 7 years from 2008 to 2014 (%), PR Prevalence ratio, CI Confidence interval, Ref Reference
^a Adjusted for income levels and type of medical insurance qualification for comparing age groups, and adjusted for age and type of medical insurance qualification for comparing income levels
^b Q0: Medical aid beneficiaries, Q1: The lower class (75–100%), Q2: The lower-middle classes (50–74%), Q3: The upper-middle classes (25–49%), Q4: The upper class (1–24%)

ISSN: 1471-2458