Table. Risk factors for the Beijing genotype of Mycobacterium tuberculosis, the Netherlands, 1993–2000.

Risk factor	Beijing genotype	Total	(%)	Odds ratio
				Crude	Adjustedb (95% confidence intervals)
Y of diagnosis
1993	23	669	3	1.09	1.08 (1.03 to 1.13)
1994	41	941	4	(per year)
1995	56	863	6
1996	50	946	5
1997	64	872	7
1998	58	804	7
1999	74	879	8
2000	49	855	6
Sex
Male	254	4,135	6	1
Female	161	2,694	6	0.97
Age group
<25	120	1,522	8	1	1
25–34	123	1,925	6	0.80	0.69 (0.53 to 0.91)
35–44	64	1,080	6	0.74	0.60 (0.43 to 0.83)
45–54	23	614	4	0.45	0.36 (0.23 to 0.57)
55–64	24	493	5	0.60	0.55 (0.35 to 0.88)
65–74	40	517	8	0.98	0.78 (0.52 to 1.15)
75+	21	678	3	0.37	0.30 (0.18 to 0.50)
Nationality
Netherlands	160	2,825	6	1	1
Europe (central and eastern)	20	231	9	1.58	1.27 (0.77 to 2.09)
Turkey	3	339	1	0.15	0.12 (0.04 to 0.38)
Morocco	19	650	3	0.50	0.41 (0.25 to 0.68)
Somalia	21	957	2	0.37	0.27 (0.17 to 0.44)
Africa (other)	28	594	5	0.82	0.63 (0.41 to 0.96)
Asia	140	786	18	3.61	3.01 (2.32 to 3.91)
Other	19	345	6	0.97	0.86 (0.53 to 1.42)
Unknown	5	102	5	0.86	0.73 (0.29 to 1.84)
RFLP clusteringa
No	212	3,227	7	1
Yes, first case	57	1,052	5	0.81
Yes, later case	146	2,550	6	0.86
Localization
Pulmonary	268	4,064	7	1
Extrapulmonary	113	2,122	5	0.80
Pulmonary and extrapulmonary	34	643	5	0.79
Residing in Netherlands
<6 months	46	641	7	1
6–11 mo	12	301	4	0.54
12–23 mo	28	358	8	1.10
2–4 y	53	767	7	0.96
>5 y	122	1,710	7	0.99
Born in Netherlands	117	2,437	5	0.65
No information	37	615	6	0.83
Drug resistance
Susceptible	332	5,910	6	1
H only	11	227	5	0.86
S only	34	358	9	1.76
Other patterns	26	221	12	2.24
Multidrug-resistant	9	53	17	3.44
Unknown	3	60	5	0.88
Multidrug resistance
Yes	9	53	17	3.21	2.64 (1.22 to 5.74)
No	406	6,776	6	1	1
HIV infection
Yes	14	294	5	0.76
No	401	6,535	6	1

^aRFLP, restriction fragment length polymorphism.

^bAdjusted for year of diagnosis, age, nationality, and multidrug resistance