Table 4.

Number of respiratory tract infections (RTI) and antibiotic (ATB) courses during 1 year prior to inclusion into the study in subgroups of common variable immunodeficiency patients. Sufficient data were available in 83 patients. The data are given as mean (standard deviation).

	Normal (n = 50)	Low (n = 18)	Deficient (n = 15)	N versus L versus D P-value*	N versus L+D P-value**	N+L versus D P-value**
No of RTI infections	2·4 (2·1)	3·3 (2·6)	2·6 (1·5)	0·541	0·576	0·810
No. of ATB courses	1·6 (1·8)	1·8 (2·6)	1·5 (1·3)	0·761	0·655	0·901

^*Kruskal–Wallis test;

^**Mann–Whitney test. N, normal; L, low; D, deficient serum mannan-binding lectin levels.