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Table 2 Descriptive statistics of participants and nonparticipants

From: The association between body mass index and skin problems in persons with a lower limb amputation: an observational study

Characteristics Participants (N = 413) Nonparticipants (N = 66) p
Mean age ±SD (y) 62.3 ±14.9 64.3 ±11.9 0.320
Sex (%) 413 valid cases 65 valid cases  
Men 290 (70%) 44 (68%) 0.680*
Women 123 (30%) 21 (32%)  
Amputation level (%) 409 valid cases 57 valid cases  
Ankle disarticulation 5 (1%) 0 (0%) 0.235**
Trans-tibial amputation 234 (57%) 26 (46%)  
Knee disarticulation 44 (11%) 7 (12%)  
Trans-femoral amputation 116 (28%) 24 (42%)  
Hip disarticulation 6 (2%) 0 (0%)  
Rotationplasty 4 (1%) 0 (0%)  
BMI (kg/m2) 386 valid cases   
Mean BMI ±SD (95% CI) 27.5 ±5.0 (27.0−28.0)   
BMI category (%) 386 valid cases   
Underweight (<18.5 kg/m2) 7 (2%)   
Normal weight (18.5-24.9 kg/m2) 119 (31%)   
Overweight (25.0-29.9 kg/m2) 152 (39%)   
Obesity (≥30 kg/m2) 108 (28%)   
Body weight (%) 380 valid cases   
<100 kg 330 (87%)   
≥100 kg 50 (13%)   
Median time since amputation (y, IQR) 400 valid cases   
12.4 (3.2;30.7)   
Reason for amputation (%) 409 valid cases   
Trauma 159 (39%)   
Diabetes and/or PAD 114 (28%)   
Other 47 (12%)   
Malignancy 40 (10%)   
Infection 38 (9%)   
Congenital 11 (3%)   
Comorbidity (%) 405 valid cases   
None 207 (51%)   
Duration use of prosthesis (%) 405 valid cases   
0-12 hours/day 142 (35%)   
≥12 hours/day 263 (65%)   
Walking distance outdoors (%) 404 valid cases   
<500 meters/day 219 (54%)   
≥500 meters/day 185 (46%)   
Time walking with prosthesis indoors (%) 407 valid cases   
<50% 105 (26%)   
≥50% 302 (74%)   
Use of walking aid (%) 407 valid cases   
Yes 224 (55%)   
Any skin problem in month prior to completing questionnaire (%) 413 valid cases   
Yes 319 (77%)   
Severe skin problem in month prior to completing questionnaire (%)a 397 valid cases   
Yes 125 (32%)   
Skin problems in period >1 month prior to completing questionnaire (%) 400 valid cases   
Yes 250 (63%)   
  1. aSkin problem with a negative impact on use of the prosthesis and/or a high or very high degree of discomfort due to an itching skin, sensitive skin, prickly skin and/or painful skin (using a 4-point scale: none, limited, high, very high)
  2. *Pearson Chi-Square = 0.170
  3. **Pearson Chi-Square = 6.548, exact procedure