Table 2. The number of observed and hidden cases and prevalences in the total and non-screened population.

		Total populationa	ObservedHCVcases	HiddenHCV cases(95%CI)	Prevalence(95%CI)	Prevalencehidden cases(95%CI)
Sex	Male	244,361	573	1,166 (838–1622)	0.71% (0.58–0.90)	0.48%(0.34–0.66)
	Female	257,922	250	454 (275–748)	0.27% (0.20–0.39)	0.18%(0.11–0.29)
	Sum			1,620 (889–2951)
Ageb	18–25	56,158	21	7 (2–24)	0.05% (0.04–0.08)	0.01%(0.00–0.04)
	26–35	65,627	159	269 (152–475)	0.65% (0.47–0.97)	0.41%(0.23–0.72)
	36–45	95,970	352	764 (502–1162)	1.16% (0.89–1.58)	0.80%(0.52–1.21)
	46–55	97,728	218	592 (284–1236)	0.83% (0.51–1.49)	0.61%(0.29–1.26)
	56–65	84,322	47	45 (16–127)	0.11% (0.07–0.21)	0.05%(0.02–0.15)
	>65	102,478	26	4 (2–10)	0.03% (0.03–0.04)	0.00%(0.00–0.01)
	Sum			1,681 (211–13,364)
SESsw	Low	233,983	609	1073 (784–1468)	0.72% (0.60–0.89)	0.46%(0.34–0.63)
	Middle	141,049	124	333 (156–711)	0.32% (0.20–0.59)	0.24%(0.11–0.50)
	High	127,250	90	170 (85–342)	0.20% (0.14–0.34)	0.13%(0.07–0.27)
	Sum			1,576 (537–4,626)
SESpv	Low	224,326	542	977 (702–1358)	0.68% (0.55–0.85)	0.44%(0.31–0.61)
	Middle	178,958	218	570 (322–1007)	0.44% (0.30–0.68)	0.32%(0.18–0.56)
	High	98,999	63	25 (9–71)	0.09% (0.07–0.14)	0.03%(0.01–0.07)
	Sum			1,596 (561–4,541)
Total		502,283	823	1,621(1231–2135)	0.49%(0.41–0.59)	0.32%(0.25–0.43)

Laboratory surveillance data, South Limburg, the Netherlands, 2002–2008.

^aBased on population statistics from 2007 [27].

^bAge at first positive test.

HCV: hepatitis C virus.

SESsw: Socio-economic status based on % of people receiving social welfare.

SESpv: Socio-economic status based on property value.