Table 2.

Beijing family genotype M. tuberculosis isolates from 356 tuberculosis cases

	No.(%) isolates No.	(%) of Beijing isolates	Odds Ratio	95% C.I.	p-value
Age group (yr)	356	187 (52.53)
≦ 25	34 (9.55)	29 (85.29)	5.80	2.11–15.98	0.0002
≦ 30	54 (15.17)	37 (68.52)	2.18	1.11–4.28	0.02
31–60	95 (26.69)	50 (52.63)	1.11	0.65–1.90	0.7
61–75	85 (23.88)	39 (45.88)	0.85	0.49–1.48	0.56
≧ 76	122 (34.27)	61 (50.00)	1	reference group