Methods for additional analyses (e.g. subgroup analyses) {20b}
midportion tendinopathy, tendinopathy
ACHILLES TENDINOPATHY
The heterogeneity in tendinopathy will be addressed by sub-group analysis. AT will be categorised into midportion and insertional tendinopathy. The assessor will make the diagnosis of the type of Achilles tendinopathy. Midportion AT will be diagnosed by local thickening and a colour doppler flow of at least two out of four in the modified Öhberg score 2–6 cm proximal to the insertion of the Achilles tendon. Insertional AT will be diagnosed by local thickening and colour Doppler flow of at least grade two of four in the modified Öhberg score within 2 cm of the insertion of the Achilles tendon. Sub-group analysis will be performed to understand if PEMF has clinical effects on all outcome measures in the midportion tendinopathy and insertional tendinopathy, respectively, since the number of participants will be smaller in the subgroups. A non-parametric test, the Mann–Whitney 