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The aim of this study was to clarify the proportion of women with low back and/or pelvic pain (LBPP) and LBPP-related factors at the early stage of pregnancy and to clarify the differences between LBPP-related factors in primiparous women and multiparous women in Japan. 157 pregnant women were recruited. Information about the presence of LBPP, degree of pain by using a visual analog scale (VAS), location of pain, past history of LBPP and background characteristics were collected. Physical status was assessed by the pregnancy mobility index (PMI). The Ethics Committee of Tokushima University Hospital approved the study. The proportion of women who complained of LBPP was 65.6%. PMI score in women with LBPP was significantly higher than that in women without LBPP (p<0.001). The proportions of women with a past history of LBPP before pregnancy and with a past history of LBPP in the previous pregnancy were significantly higher in women with LBPP (p<0.001 and p=0.002, respectively). In women with LBPP, the score of VAS in multiparous women was significantly higher than that in primiparous women (p=0.019). Early management for women with a past history of LBPP before pregnancy and with a past history of LBPP in the previous pregnancy is important. Management for lumbar pain according to parity is needed for health guidance at the early stage of pregnancy.   Key words: Pregnancy, first trimester, low back pain, pelvic pain, parity.

Factors related with low back pain and pelvic pain at the early stage of pregnancy in Japanese women