Estimated mean values over time for intervention (in black) and control groups (in white). (a-l). Represented outcome parameters are according to the final random intercept models (Table 2). Graphs have broken y-axes to improve readability. PP is peak pressure; PTI is pressure–time-integral; tCOP is center-of-pressure expressed as percentage of the stance phase for it to enter the forefoot; F/R-ratio is the forefoot to rearfoot PTI ratio. Significant time effects over 52 weeks and group differences are marked with: * = p ≤ 0.05, † = p ≤ 0.01, ‡ = p ≤ 0.001.