TY - JOUR T1 - Answers to the questions on <em>Approaches for estimating prevalence ratios</em> by J A Deddens and M R Petersen, on pages 501–6. JF - Occupational and Environmental Medicine JO - Occup Environ Med SP - 481 LP - 481 VL - 65 IS - 7 A2 - , Y1 - 2008/07/01 UR - http://oem.bmj.com/content/65/7/481.abstract N2 - (1) False … ER -