Supplemental Table. RESULTS OF FULL MODEL WITH FITTING DIAGNOSTICS
Background Factors PR 95% CI P
Demographic variables Age, y
<60 1 [Ref.]
60-74 0.95 0.72-1.26 .727
≥75 0.73 0.49-1.07 .109
Sex
Male 1 [Ref.]
Female 1.20 0.95-1.52 .129
Race
Chinese 1.02 0.76-1.37 .883
Malay 0.97 0.71-1.34 .864
Indian and others 1 [Ref.]
Body mass index
Normal 1 [Ref.]
Overweight 0.88 0.67-1.16 .371
Obese 1.13 0.84-1.54 .422
DFU variables Wound size, cm2
<1 1 [Ref.]
1-10 0.61 0.47-0.79 <.001
>10 0.55 0.36-0.84 .006
Wound depth, cm
<0.5 1 [Ref.]
≥0.5 0.99 0.77-1.28 .949
DFU duration <6 mo 1 [Ref.]
DFU duration≥6 mo 0.35 0.22-0.57 <.001
DFU location
Toe only 1.20 0.45-3.19 .712
Toe and others (plantar/heel/dorsum) 0.66 0.19-2.35 .522
Plantar only 0.95 0.36-2.50 .911
Heel only/dorsum only/more than two locations other than toe 1.26 0.49-3.30 .630
Type of DFU
Neuropathic 1 [Ref.]
Ischemic 0.55 0.30-1.00 .050
Neuroischemic 0.73 0.53-0.99 .042
Wound infected (on oral antibiotics) 1.07 0.84-1.38 .128
Emergency referral 0.73 0.49-1.09 .128
Other clinical variables
Duration of DM, y
<5 1 [Ref.]
≥5 0.84 0.63-1.11 .232
Treatment of DM
Polyclinic 0.94 0.63-1.40 1.404
Hospital 0.87 0.48-0.58 1.291
GP or self-manage 1 [Ref.]
(continues)
Supplemental Table. RESULTS OF FULL MODEL WITH FITTING DIAGNOSTICS , CONTINUED
Background Factors PR 95% CI P
Hemoglobin A1c< 7% 0.88 0.58-1.33 .545
Hemoglobin A1c≥7% 0.77 0.54-1.10 .160
Hemoglobin A1cnot done or recorded 1 [Ref.]
Diabetic foot screening
Within 1 y 1 [Ref.]
More than 1 y ago 0.83 0.61-1.12 .229
Never/no record 0.82 0.57-1.16 .257
History of previous ulcer 1.08 0.81-1.44 .610
History of previous amputation 0.77 0.52-1.13 .185
History of end-stage renal failure 0.85 0.54-1.35 .489
Model fitting diagnostics
Akaike's information criterion 738.747
Bayesian information criterion 866.3662
Abbreviations: CI, confidence interval; DFU, diabetes foot ulcer; DM, diabetes mellitus; GP, general practitioner; PR, prevalence ratio; Ref., reference category.
