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 .
Randomized placebo controlled trial of lofexidine hydrochloride for chronic pelvic pain in women.
BACKGROUND We hypothesised that the orally-active alpha(2)-adrenoceptor agonist lofexidine hydrochloride would ameliorate  chronic pelvic pain in women . METHODS A r and omized placebo-controlled parallel group trial was undertaken in the University Hospital Gynaecology Clinic . Women with pelvic pain of at least 6 months duration were eligible , and were r and omized using a sealed envelope system to receive up to 600 mg lofexidine hydrochloride twice daily over 8 weeks or placebo . Outcome measures were summary and daily diary visual analog scales for pain ( VAS ) and a 5 point self rating scale . RESULTS 9/19 women r and omized to lofexidine completed the study compared to 14/20 of those r and omized to placebo . Intention-to-treat analysis showed that 4/19 in the lofexidine group achieved 50 % or greater reduction in VAS compared with 8/20 in the placebo group ( OR 2.5 , 95 % CI 0.6 - -10.3 ) . Summary and diary VAS were closely correlated . CONCLUSIONS Within the limits of a small study with power to detect only a substantial effect , we conclude that lofexidine hydrochloride is not effective for the treatment of chronic pelvic pain
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 .