Effect of active wound dressing on postoperative pain and wound healing in patients undergoing anorectal surgery | BMC Gastroenterology
Sample size calculation The formula below is used to determine the sample size: The rate is estimated and calculated with the hypothesis test formula “n = Z²α/2π (1-π) /δ²”. When the class I risk probability α is 0.05, the class II risk probability β is 0.10, Z²α/2 = 11, π is 0.10, the maximum sample size can be obtained … Read more