Prognostic models for predicting the risk of foot ulcer or amputation in people with type 2 diabetes: a systematic review and external validation study.

Exceptions to the good calibration were an observed/expected ratio ranging from 0.7 to 1.6 in the study by Goodney et al (2010) [ 33 ] and borderline significant calibration tests for models by Venermo et al ( p ≥ 0.07) and Basu et al ( p ≥ 0.05) [ 27 , 36 ].

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