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 .
Effects of triptorelin versus placebo on the symptoms of endometriosis.
OBJECTIVE To compare the effect of a GnRH-agonist , triptorelin , versus placebo on the symptoms of endometriosis .  DESIGN A prospect i ve , r and omized , double-blind study of 6 months of treatment followed by 12 months of follow-up . SETTING Departments of Obstetrics and Gynecology at two universities and one general hospital . PATIENT(S ) Forty-nine women with symptoms of laparoscopically verified endometriosis . INTERVENTION(S ) Triptorelin depot or placebo was given every 4 weeks . Clinical evaluation , including the Duration Intensity Behavior Scale and Visual Analogue Scale for pain , was performed before the injections and up to 12 months after treatment . A control laparoscopy was performed 4 - 6 weeks after the last injection . MAIN OUTCOME MEASURE(S ) Quantitation of pain . RESULT ( S ) Twenty-four patients had active treatment and 25 received placebo .  Pain symptoms according to both scales were significantly more reduced after 2 months of triptorelin treatment compared to placebo . The extent of endometriotic lesions was reduced 50 % during triptorelin treatment and increased 17 % during placebo . The average area of endometriotic lesions was reduced 45 % during triptorelin treatment but was unchanged during placebo . Side effects , mainly hot flushes , were experienced by 80 % of the actively treated group but also by 33 % of patients in the placebo group . Because of recurrent symptoms , only five patients could be observed for 12 months after completion of treatment . CONCLUSION ( S ) Triptorelin reduces endometriotic lesions and pain to a significantly higher degree than placebo
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 .