Archived Comments for:
Platelet-rich plasma (PRP): an adjuvant to hasten hamstring muscle recovery. A randomized controlled trial protocol (ISCRTN66528592)
Inserting the numbers given into the formula provided gives an alternative mean time to return to play close to zero. What is the rationale for that assumption?
Quoted RTP times are obviously from a positively skewed distribution and may be censored at 16 weeks. Together with the small sample sizes these facts speak against planing a t-test as implied by the formula.
Sample size calculation faulty?
17 October 2014
Inserting the numbers given into the formula provided gives an alternative mean time to return to play close to zero. What is the rationale for that assumption?
Quoted RTP times are obviously from a positively skewed distribution and may be censored at 16 weeks. Together with the small sample sizes these facts speak against planing a t-test as implied by the formula.
Competing interests
None declared