Table 1.

Density of pigs, details of study population and hepatitis E virus seroprevalence by study centre

Study centre	Density of pigsa	Number of participants	Median age (years)	Range (years)	Male participants (%)	Seroprevalenceb (%)	[95% CI]c
Afferden	717	49	59.2	[33.5–71.1]	57.5	25.5	[13.1–38.0]
Astend	3,535	291	61.4	[20.4–71.4]	45.8	34.0	[28.6–39.5]
Bakel	3,756	315	59.3	[21.5–71.7]	47.1	29.2	[24.1–34.3]
Boxtel	988	170	59.3	[24.8–71.6]	45.0	27.2	[20.5–33.9]
Budel	1,080	200	61.4	[21.4–71.6]	49.5	32.6	[25.8–39.4]
Deurne	3,882	132	60.5	[29.0–71.7]	50.0	18.6	[11.7–25.4]
Heeswijk-Dinther	3,812	375	57.5	[20.1–71.4]	37.1	30.1	[25.5–34.8]
Heusdend	3,535	72	58.9	[24.2–71.4]	55.6	16.7	[8.1–25.3]
Horn	1,268	85	57.1	[24.0–71.7]	45.2	35.7	[25.5–46.0]
Someren	3,447	170	57.9	[28.6–71.2]	48.2	29.4	[22.6–36.3]
St. Anthonis	4,460	399	57.0	[22.6–71.8]	44.5	26.9	[22.4–31.4]
Stramproy	878	236	57.4	[21.3–72.0]	46.3	26.6	[20.9–32.4]
Total	2,506	2,494	58.6	[20.1–72.0]	45.6	28.7	[26.9–30.5]

^aNumber of pigs per km² by municipality, based on the provincial databases of mandatory environmental licenses for keeping livestock for 2012

^bAnti-HEV IgG ratio > = 0.90

^c95% Confidence Interval

^dAsten and Heusden are both situated in the municipality Asten, and therefore have the same pig density