 |
 |
Dear Allstat I want to conduct meta-analysis comparing operating times of two procedures across different studies. One paper gives the following in the table of results: Procedure A: Mean duration 24 minutes, range 11-40, N=108 Procedure B: Mean duration 19 minutes, range 5-46, N=114 P-value for difference <0.01, derived from unpaired t-test or Wilcoxon test. To include this in a meta-analysis with results from other papers, I need the Standard Deviation (I think?). Is there any way of recovering some plausible estimate of SD from these results? Or, what assumptions would I need to make to extract some estimate of SD? Best wishes -- David Epstein Departamento de Economía Aplicada Universidad de Granada Facultad de Ciencias Económicas y Empresariales Campus de Cartuja, s/n, 18071. GRANADA Teléfono:+34 958 249973 / 246258 <http://www.ugr.es/~davidepstein/> FAX: +34 958 244046 email: [log in to unmask] ============================== Honorary Visiting Research Fellow Centre For Health Economics University of York Heslington York Y010 5DD email: [log in to unmask] ============================== You may leave the list at any time by sending the command SIGNOFF allstat to [log in to unmask], leaving the subject line blank.