. Author manuscript; available in PMC: 2013 Jun 1.

Published in final edited form as: Infect Genet Evol. 2011 Aug 2;12(4):664–670. doi: 10.1016/j.meegid.2011.07.018

Table 2. Proportions of Clustered and Recently Transmitted Isolates by Prevalent Families.

Cluster proportions of RD^Rio, related groups, and major families are shown. Clustered percentage was calculated by the total number of clustered isolates in each group divided by the total number of isolates for the group. The “n-1” cluster percentage was calculated by the total number of secondary cases in each group divided by the total number of isolates for the group. Pearson’s chi-square was used to test the difference between clustered versus non-clustered cases and secondary verses all others cases. P-values were not adjusted for multiple testing. Ref denotes reference group.

Groups	Clustered (%)	P	“n-1” Clustered (%)	P
RD^Rio (n=302)	154 (51.0)	Ref	113 (37.4)	Ref
Non-RD^Rio LAM (n=364)	155 (42.6)	0.035	107 (29.4)	0.03
Beijing (n=581)	202 (34.8)	<0.0001	139 (23.9)	<0.0001
Haarlem (n=626)	292 (46.7)	0.23	221 (35.3)	0.56
T (n=568)	185 (32.6)	<0.0001	120 (21.1)	<0.0001
EAI (n=304)	96 (31.6)	<0.0001	69 (22.7)	<0.0001
CAS (n=182)	26 (14.3)	<0.0001	15 (8.2)	<0.0001