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Table 2 Assessment of patient’s characteristics and risk factors that could be associated with multidrug-resistant Mycobacterium tuberculosis clustering of cases, considering the cases reported between 2014 and 2017

From: A nationwide study of multidrug-resistant tuberculosis in Portugal 2014–2017 using epidemiological and molecular clustering analyses

MDR-TB patient

Characteristic

Unknown

Unique

(n = 25)

Clustered

(n = 42)

Univariate analysis

n (%)

n (%)

OR (95% CI)

p-value

Age group

< 45 years old

0

16 (64.0)

21 (50.0)

Ref

0.267

≥45 years old

9 (36.0)

21 (50.0)

1.78 (0.64–6.91)

Gender

Female

0

7 (28.0)

9 (21.4)

Ref

0.543

Male

18 (72.0)

33 (78.6)

1.43 (0.46–4.47)

Country of origin

Foreign-born

1

12 (50.0)

9 (21.4)

Ref

0.019

Native

12 (50.0)

33 (78.6)

3.67 (1.24–10.88)

HIV status

Negative

4

21 (87.5)

27 (69.2)

Ref

0.109

Positive

3 (12.5)

12 (30.8)

3.11 (0.78–12.46)

Alcohol abuse

No

6

22 (95.7)

26 (68.4)

Ref

0.032

Yes

1 (4.3)

12 (31.6)

10.15 (1.22–84.39)

Injectable drug use

No

8

20 (87.0)

29 (80.6)

Ref

0.525

Yes

3 (13.0)

7 (19.4)

1.61 (0.37–6.98)

TB treatment history

Never treated

4

15 (62.5)

25 (64.1)

Ref

0.898

Previously treated

9 (37.5)

14 (35.9)

0.93 (0.33–2.68)

Site of disease

Pulmonary

4

24 (42.9)

32 (57.1)

n/a

n/a

Extra-pulmonary

0 (0.0)

7 (100.0)

  1. CI confidence interval, OR odds ratio, Ref reference
  2. Statistically significant values are indicated in bold