Post epidemic giardiasis and gastrointestinal symptoms among preschool children in Bergen, Norway. A cross-sectional study

Table 2 Demographic data for exposed and unexposed groups, Bergen, Norway 2005.

	n	Exposed	n	Unexposed	P-value
Sex, n	378		135		0.55^F
Girls n (%)		181 (47.8)		69 (51.1)
Boys n (%)		197 (52.2)		66 (48.9)
Ethnical background, n	331		120		0.21^P
European n (%)		301 (90.1)		110 (91.7)
African n (%)		2 (0.6)		3 (2.5)
Asian n (%)		14 (4.2)		2 (1.7)
Other n (%)		14 (4.2)		5 (4.2)
Travelled outside of Northern Europe last year, n (%)	374	144 (38.5)	132	48 (36.4)	0.68 ^F
Number of members in the household (mean ± SE)	376	3.9 ± 0.1	135	4.1 ± 0.1	0.02 ^W
Age in months (mean ± SE)	356	36.9 ± 0.9	133	34.9 ± 1.3	0.32 ^W

F = Fishers exact test (2-sided)
P = Pearson chi-square test (2-sided)
W = Wilcoxon- Mann-Whitney test
SE = Standard error
Demographic data for 513 children aged 0-5 years classified as exposed and unexposed to Giardia-contaminated drinking water according to self-report on a mailed questionnaire in the city of Bergen, Norway 2005.

ISSN: 1471-2458