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Table 4 Interaction between variables of interest and treatment with custom insoles compared to sham insoles for the total FFI score at 26-weeks follow-up

From: Can we predict which patients with plantar heel pain are more likely to benefit from insoles? A secondary exploratory analysis of a randomized controlled trial

Variables Unstandardized β (95% CI) Interpretation
Body Mass Index (kg/m2) 0.49 (−1.00, 1.98) Lower BMI is associated with a lower total FFI score in patients treated with custom insole (non-significant)**
Neuropathic pain DN4 total score (0–10) 1.58 (− 2.56, 5.73) Lower score on the DN4 score for neuropathic pain is associated with a lower total FFI score in patients treated with custom insole (non-significant)**
Bilateral pain (yes) −2.16 (− 21.49, 17.16) Presence of bilateral pain is associated with a lower total FFI score in patients treated with custom insole (non-significant)**
Sex (male) −12.10 (−29.46, 5.25) Male sex is associated with a with a lower total FFI score in patients treated with custom insole (non-significant)**
FFI score at baseline 0.02 (−0.39, 0.43) Lower FFI score at baseline is associated with a lower total FFI score in patients treated with custom insole (non-significant)**
First step pain at baseline 0.47 (−3.07, 4.01) Lower pain score for first step pain at baseline is associated with a lower total FFI score in patients treated with custom insole (non-significant)**
  1. *Variables were multiplied with a factor indicating treatment (custom insole vs sham)
  2. **A lower total FFI is indicative of a lower pain and better function