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Table 2 OR (95% CI) of cold injuries by subject’s characteristics, stratified by BMI classification

From: Increased cold injuries and the effect of body mass index in patients with peripheral vascular disease

Characteristics

Underweight

(< 18.5 kg/m2)

Normal weight

(18.5–24.9 kg/m2)

Overweight

(25–29.9 kg/m2)

Obese

(≥30 kg/m2)

OR

(95% CI)

p-value

OR

(95% CI)

p-value

OR

(95% CI)

p-value

OR

(95% CI)

p-value

Age (year)

  

0.2260

  

0.0914

  

0.1297

  

0.9767

 20–29

Reference

 

Reference

 

Reference

 

Reference

 

 30–39

0.84

(0.58–1.21)

 

0.92

(0.82–1.04)

 

0.79

(0.61–1.04)

 

1.11

(0.51–2.42)

 40–49

0.80

(0.49–1.31)

 

0.97

(0.87–1.10)

 

0.98

(0.76–1.26)

 

0.88

(0.37–2.07)

 50–59

1.38

(0.84–2.27)

 

0.91

(0.79–1.05)

 

1.11

(0.85–1.44)

 

1.30

(0.55–3.07)

 60–69

1.08

(0.64–1.82)

 

0.94

(0.80–1.11)

 

1.12

(0.84–1.50)

 

1.34

(0.52–3.46)

 70–79

0.42

(0.17–1.03)

 

0.74

(0.57–0.97)

 

0.97

(0.60–1.57)

 

0.86

(0.11–6.68)

 80-

0.58

(0.14–2.35)

 

0.33

(0.12–0.87)

 

1.59

(0.50–5.05)

 

NC

(NC-NC)

 

Sex

  

0.0283

  

< 0.0001

  

0.0125

  

0.0180

vMale

Reference

 

Reference

 

Reference

 

Reference

 

 Female

1.44

(1.04–2.00)

 

1.46

(1.34–1.59)

 

1.22

(1.04–1.42)

 

1.98

(1.13–3.49)

Household income

  

0.7225

         

  ≤ 25%

Reference

 

Reference

0.0072

Reference

0.0852

Reference

0.3805

 26–50%

0.88

(0.60–1.29)

 

0.90

(0.80–1.00)

 

0.79

(0.63–0.98)

 

1.01

(0.52–1.95)

 51–74%

1.08

(0.74–1.57)

 

0.90

(0.81–1.01)

 

0.82

(0.67–1.02)

 

0.69

(0.32–1.46)

  ≥ 75%

0.88

(0.59–1.31)

 

0.82

(0.73–0.92)

 

0.81

(0.66–1.00)

 

0.54

(0.24–1.22)

Smoking status

  

0.0129

  

< 0.0001

  

0.0006

  

0.1156

 Never smoker

Reference

 

Reference

 

Reference

 

Reference

 

 Current smoker

0.65

(0.45–0.95)

 

0.64

(0.58–0.71)

 

0.69

(0.57–0.84)

 

0.61

(0.31–1.18)

 

 Past smoker

0.35

(0.13–0.94)

 

0.81

(0.69–0.95)

 

0.99

(0.78–1.25)

 

0.31

(0.08–1.30)

Alcohol drinking

  

0.8116

  

0.0001

  

0.0189

  

0.0215

 No

Reference

 

Reference

 

Reference

 

Reference

 

 Yes

0.97

(0.73–1.29)

 

0.85

(0.78–0.92)

 

0.83

(0.71–0.97)

 

0.50

(0.28–0.90)

Regular exercise

  

0.3623

  

0.0051

  

0.7721

  

0.7864

 No

Reference

 

Reference

 

Reference

 

Reference

 

 Yes

0.86

(0.63–1.19)

 

0.89

(0.82–0.96)

 

0.98

(0.84–1.14)

 

0.93

(0.54–1.59)

High blood pressurec

  

0.1973

  

0.0003

  

0.0009

  

0.8034

 No

Reference

 

Reference

 

Reference

 

Reference

 Yes

0.59

(0.26–1.32)

 

0.75

(0.64–0.88)

 

0.68

(0.55–0.86)

 

0.93

(0.50–1.70)

Hyperglycemiad

  

0.4259

  

0.1175

  

0.1310

 

0.2632

 No

Reference

 

Reference

 

Reference

 

Reference

 Yes

0.67

(0.25–1.80)

 

0.85

(0.69–1.04)

 

0.79

(0.59–1.07)

 

0.56

(0.20–1.55)

  1. ap-value was calculated using the Chi-square test for categorical variables
  2. bHigh blood pressure was indicated if systolic/diastolic was over 140/90 (mm/Hg)
  3. cHyperglycemia was indicated if blood sugar was greater than 125(mg/dl)
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