In a study of 500 women during labor, 352 experienced pain in the lumbar area during labor, an incidence of 70.4%. Low back pain during was associated with baby presentation. Application of pressure to the lumbar area to inhibit lumbar pain reduced the need for major narcotic pain medication and minor tranquilizing medication.
Guthrie RA, Martin RH. J Am Osteopath Assoc. 1982 (Dec); 82 (4): 247-251