Fig. 1

Flow chart of the inclusion process into the randomized controlled trial. a 3 women did not meet for scheduled appointment for treatment and did not respond to several attempts of contact. They were included in the intention-to- treat analyses, but excluded from per-protocol subanalyses. b 7 women underwent chiropractic treatment as conventional care. They were included in the control group in the intention-to-treat analyses but excluded in the per protocol subanalyses. c 1 missing observation. The woman did not fill in questionnaires nor meet for clinical examination at 30 weeks of pregnancy, but returned to the study six weeks after delivery. d 2 missing observations. The women woman did not fill in questionnaires nor meet for clinical examination at 30 weeks of pregnancy, but returned to the study six weeks after delivery