1%). With the definition used in the present study (score of average pain during the previous week > 5), pain was classified as severe in 20.0% of all subjects with LPP. Kristiansson et al. (1996) concluded that pain was severe in about 30% of their subjects with LPP; however, no specific definition of ‘severe’ was given. In a study by Östgaard et al. (1991) 36% of the subjects with

LPP described their pain as ‘significant’. In a population-based study of Bjelland et al. (2010) among 75,939 women in TAM Receptor inhibitor the 30th week of pregnancy 58% of the subjects reported pain in the pelvic region; 12.6% of all women (thus 21.7% of all women with pain in the pelvic region) reported to have severe pain in at least one location in the pelvis. In that study anterior

pelvic pain was included, but isolated LBP excluded. These latter percentages are largely the same as those in the present study. In a population-based study by Kristiansson et al. (1996) their score of ‘pain max’ in the 3rd quartile was 5.9 (similar to the present study) whereas their ‘pain now’ score was 3.2 compared to 2.4 in the present study. Mean QBPDS score of women with LPP was 26.8. Using the definition of the present study, 20.9% of the population is classified with ‘severe’ disability. We found www.selleckchem.com/products/bmn-673.html no population-based studies which have used this scale. A problem with load transfer (as advocated to be measured by the ASLR) was classified as ‘severe’ in only 8.2% of the subjects with LPP. ASLR was positive in 55.7% of the subjects with LPP and in 12.5% of the controls. In a comparable study, ASLR was positive (according to the definition of the present study) in 70.3% of participants with LPP and 37.3% in those without LPP (Robinson et al., 2010). The higher score in the study of Robinson et al. might be explained (in part) by a difference in the duration of the pregnancy: in the present 4-Aminobutyrate aminotransferase study 20–30 weeks compared with week 30 in the study by Robinson et al. Another explanation could be that the study of Robinson et al. was part of a longitudinal study in which participants answered questionnaires seven times during and after pregnancy. The threshold for reporting PGP-related symptoms probably decreased

due to the focus of participating in a study. Robinson used this theory to explain the much larger prevalence of LPP in her longitudinal study than in her population-based study (Robinson, 2010 and Robinson et al., 2010). The percentage of subjects with a positive PPPP test (at one or both sides) was 43.6% (Table 3). The scores of PPPP in three comparable studies are clearly higher. In a study of Östgaard et al. (1994) the test was positive (at one or both sides) in 81.5% of pregnant subjects with posterior pelvic pain. Kristiansson and Svärdsudd (1996) used the term ‘femoral compression test’ to indicate the PPPP test. In their group of pregnant women, the test was positive (at one or both sides) in 47% of women with ‘lumbosacral’ pain, and in 69% with ‘sacral’ pain.