RESULTS The instruments most frequently used were single-item VAS and Biberoglu and Behrman pain score , while multidimensional inventories were used in few studies .
The results of clinical studies in CPP are more frequently based on one-dimensional measurements .
RATIONALE Many types of  pain assessment are available to research ers carrying out clinical trials in chronic pelvic pain ( CPP ) , ranging from a single-item scale to multidimensional inventories .
AIM Our objective was to investigate which assessment s of pain are more commonly used in clinical trials on CPP .
Comparison of contraceptive ring and patch for the treatment of symptomatic endometriosis.
OBJECTIVE To evaluate the efficacy and tolerability of a contraceptive vaginal ring and transdermal patch in the treatment of  endometriosis-associated pain .  DESIGN Patient preference cohort study . SETTING Academic center . PATIENT(S ) Two-hundred and seven women with recurrent moderate or severe pelvic pain after conservative surgery for symptomatic endometriosis . INTERVENTION(S ) Continuous , 12-month treatment with a vaginal ring supplying 15 mcg of ethinyl E and 120 mcg of etonogestrel per day or a transdermal system delivering 20 mcg of ethinyl E and 150 mcg norelgestromin per day . MAIN OUTCOME MEASURE(S ) Satisfaction with treatment . RESULT ( S ) One-hundred and twenty-three women preferred the ring , and 84 preferred the patch . Forty-four ring users ( 36 % ) and 51 patch users ( 61 % ) withdrew . Thirty-six of 79 subjects ( 46 % ) in the ring group and 14 of 33 ( 42 % ) in the patch group shifted from continuous to cyclic use because of irregular bleeding . Pain symptoms were reduced by both treatments , with the ring being more effective than the patch in patients with rectovaginal lesions . According to an intention-to-treat analysis , 88 of 123 ring users ( 72 % ) and 40 of 84 patch users ( 48 % ) were satisfied with the treatment received . CONCLUSION ( S ) Patients who preferred the ring were significantly more likely to be satisfied and to comply with treatment than those who chose the patch . Both systems were associated with poor bleeding control when used continuously
RESULTS The instruments most frequently used were single-item VAS and Biberoglu and Behrman pain score , while multidimensional inventories were used in few studies .
The results of clinical studies in CPP are more frequently based on one-dimensional measurements .
RATIONALE Many types of  pain assessment are available to research ers carrying out clinical trials in chronic pelvic pain ( CPP ) , ranging from a single-item scale to multidimensional inventories .
AIM Our objective was to investigate which assessment s of pain are more commonly used in clinical trials on CPP .