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Percentage change in wound size from baseline. Abbreviations: LFCUD, low‐frequency contact ultrasound debridement; UC, usual care. (Baseline wound surface area (WSA) = 100%). Linear trend in WSA reduction was significant (P = <0.01) for LFCUD group during treatment period (Week 0 to Week 5) but not significant for UC; P = (0.935) as adjusted not assuming equal variances
