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Table 4 Assumptions for sample size calculations

From: Dosing study of massage for chronic neck pain: protocol for the dose response evaluation and analysis of massage [DREAM] trial

Group Amount of massage (weekly dose) Proportion with clinically relevant improvement on NDI (at least 5 point improvement) Proportion with clinically relevant improvement on Bothersomeness score (≥ 30% improvement)
1 Waitlist 0.07 0.10
2 60 min 1×/week (60 min) 0.35 0.48
3 30 min 2×/week (60 min) 0.40 0.55
4 60 min 2×/week (120 min) 0.55 0.65
5 30 min 3×/week (90 min) 0.60 0.70
6 60 min 3×/week (180 min) 0.70 0.80