Table IV.

Distribution of the Beijing genotype by age group.

Age (Years)	Beijing strains n (%)	Odds ratio	95% CI	P-value
<25	85 (96.6)	1	-
26–40	110 (94.5)	0.97	0.21–4.45	1.00
41–60	125 (94.6)	0.90	0.21–3.85	1.00
61–75	44 (67.7)	0.06	0.02–0.23	<0.0001
>76	23 (52.3)	0.04	0.01–0.14	<0.0001

CI, confidence interval.