Figure 4.

Seasonal variability of the plantar and whole foot ∆Ts of neuropathic feet at risk of DFU. (a) Plantar foot. (b) Whole foot.

The consecutive 169-foot thermograms of all study participants were reorganized according to the month (season) of acquisition and were grouped into four categories: Spring (March-May), Summer (June-August), Autumn (September-November), and Winter (December-February). The bars represent the seasonal variability in the proportion of patients with normal (∆T < 2.2°C, blue bars) and abnormal (∆T ≥ 2.2°C, orange bars) temperature differences of the plantar foot (a) and of the whole foot (b).