Table 1.

Characteristics of source population and study group: number and prevalence of positive TST

Variable	Population in nation born in 1991	Population in project area born in 1991	No. TST positives in project area	Prevalence of TST positives in project area
	No.	No. (%)	No.	% (95% CI)
Total	63662	33456 (53)	531	1.6 (1.5 – 1.7)
Gender
Male	32617	17127 (53)	286	1.7 (1.5 – 1.9)
Female	31045	16329 (53)	245	1.5 (1.3 – 1.7)
Origin of child
Western-born	57775	29712 (51)	288	0.9 (0.9 – 1.1)
Second generation immigrant	2867	2052 (72)	111	5.4 (4.5 – 6.5)
First generation immigrant	3020	1692 (56)	132	7.8 (6.6 – 9.2)

Characteristics of children born in 1991 in nation and project area and 531 children referred because of positive tuberculin skin test result in the school based screening programme in Norway in the school year of 2005–6.