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Table 2 Univariate and multivariate analysis for risk factors of acquiring skin abscesses

From: Methicillin-susceptible Staphylococcus aureus skin infections among military conscripts undergoing basic training in Bangkok, Thailand, in 2014

Risk factors

Total (%)

Case (%)

P value

Crude OR (95 % CI)

P value

Adjusted OR (95 % CI)

Age (mean ± SD)

21.2 (±1.0)

21.0 (±1.0)

0.033

0.5 (0.3–0.9)

0.036

0.5 (0.3–1.0)

Education

 Bachelor

8 (4)

3 (37.5)

 

1

  

 High vocational certificate

14 (7)

4 (28.6)

0.666

0.7 (0.1–4.2)

  

 Vocational certificate

22 (10.9)

5 (22.7)

0.423

0.5 (0.1–2.8)

  

 High school

106 (52.7)

19 (17.9)

0.191

0.4 (0.1–1.7)

  

 Secondary school

51 (25.4)

7 (13.7)

0.112

0.3 (0.1–1.4)

  

Subunit

 1

54 (25.4)

20 (37)

0.001

30.6 (3.9–238.6)

0.001

32.6 (4.1–260.6)

 2

51 (23.9)

16 (31.4)

0.003

23.8 (3.0–187.5)

0.002

26.9 (3.3–218.2)

 3

55 (25.8)

4 (7.3)

0.216

4.1 (0.4–37.7)

0.178

4.6 (0.5–44.1)

 4

53 (24.9)

1 (1.9)

 

1

  

BMI (kg/m​2)

 Underweight <18.5

27 (12.7)

7 (25.9)

0.275

1.7 (0.6–4.6)

  

 Normal range (18.5–22.9)

119 (55.9)

20 (16.8)

 

1

  

 At risk of obesity (23–24.9)

29 (13.6)

5 (17.2)

0.955

1.0 (0.4–3.0)

  

 Obese I (25–29.9)

29 (13.6)

7 (24.1)

0.362

1.6 (0.6–4.2)

  

 Obese II (≥30)

9 (4.2)

2 (22.2)

0.679

1.4 (0.3–7.3)

  

Multiple erythematous papules

 Yes

86 (39.0)

27 (31.4)

<0.01

3.7 (1.8–7.6)

<0.01

3.4 (1.5–7.5)

 No

127 (59.6)

14 (11)

 

1