Table 3. Comparison of macrolide resistant rate among M. pneumoniae clinical isolates with different VNTRs.

Group	Number of repeats in Mpn1	Number of repeats in Mpn13-14-15-16	Isolates		χ2	P value
			Sensitive	Resistant
1	2/3/4/5/6	3-5-6-2	21	4	97.5	<0.001a
2	2/3/4/5/6/7	4-5-7-2	0	103	10.9	0.072b
3	3	3-5-7-2	0	1	2.8	0.001c
	6	4-4-7-2	0	1
	3/6/7	4-5-6-2	1	2
	3	4-5-7-1	0	1
	2	4-5-7-3	0	2

^a group 1 VS group 2;

^b group 2 VS group 3;

^c group 3 VS group 1.