Coefficient OR 95% CI for OR p-value
Ankle-brachial index ≤1.0 (n=149)a
Current smoking (ref. = no) 1.35 3.9 1.5 – 10.3 0.007
HbA1c (%) 1.23 3.4 1.2 – 10.2 0.028
↑Blood pressure (on examination) (ref. = no) 0.49 1.6 1.0 – 2.6 0.041
Ankle-brachial index <0.9 (n=33)b
Current smoking (ref. = no) 1.30 3.7 1.2 – 10.8 0.019
aLikelihood ratio test of model significance: p-value <0.001 (Nagelkerke R2 = 0.102).
bLikelihood ratio test of model significance: p-value =0.033 (Nagelkerke R2 = 0.030).
OR: odds ratio; CI: confidence interval; ref: reference category
Variables that were dropped out of the multivariable logistic regression using the stepwise-backward elimination method wereage, leg pain with walking, HDL, LDL and Michigan-sign score.
Table 3: Subset of significant predictors of the odds of abnormal anklebrachial index vs. selected predictors