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 .
Add-back therapy in the treatment of endometriosis-associated pain.
OBJECTIVE To determine the efficacy of GnRH analogue plus add-back therapy compared with GnRH analogue alone and estroprogestin in patients with relapse of endometriosis-associated pain . DESIGN R and omized , controlled study . SETTING University hospital . PATIENT(S ) One hundred thirty-three women with relapse of endometriosis-related pain after previous endometriosis surgery . INTERVENTION(S ) Forty-six women were treated with GnRH analogue plus add-back therapy , 44 women were given GnRH analogue alone , and 43 women received estroprogestin , for 12 months . MAIN OUTCOME MEASURE(S ) Pain evaluation by a visual analogue scale , quality of life in treated patients according to the SF-36 question naire , and occurrence of adverse effects , including bone mass density loss , at pretreatment , after 6 months of treatment , at the end of treatment ( 12 months ) , and 6 months after discontinuation of treatment . RESULT ( S ) Patients treated either with GnRH analogue alone or GnRH analogue plus add-back therapy showed a higher reduction of pelvic pain , dysmenorrhea , and dyspareunia than patients treated with oral contraceptive , whereas patients treated with add-back therapy showed a better quality of life , as assessed with the SF-36 question naire , and adverse effects rate than the other two groups . CONCLUSION ( S ) Add-back therapy allows the treatment of women with relapse of endometriosis-associated pain for a longer period , with reduced bone mineral density loss , good control of pain symptoms , and better patient quality of life compared with GnRH analogue alone or oral contraceptive
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 .