<prompt> Which of these is not a risk factor for endometriosis?Shoer menstrual cycle lengthEarly age of menarchePrior use of IUCDNulliparity  <response>: For endometriosis, following are risk factors and protective factors LEARNING TIP: Any scenario that increases number of cycles in a womans lifetime like early menarche, hypermenorrhea, no pregnancies infeilitynulliparity, shoer cycles. Also any case where there is obstruction to flow that would increase risk of retrograde menstruation are risk factors Increased risk Protective Not associated with increased risk Infeility Lactation Smoking Early menarche Prior use of IUCD Hypermenorrhea Nulliparity multiparity Mullerian anomalies Low bih weight, tall height High BMI, waist to hip ratio Endometriosis in first degree relative Tobacco exposure in utero Diet high in fat and red meat Fruit and vegetable diet 