Participants / materials , methods and setting : Cases were restricted to laparoscopically confirmed endometriosis. Weight at age 18 and height were reported at baseline , and current weight was updated every 2 years. Waist and hip measurements were first taken in 1993 and updated in 2005. Rate ratios (RR) and 95% confidence intervals (Cl) were calculated using Cox proportional hazards models with time - verying covariates.