Sixty women at Colac and 30 at Horsham agreed to participle in the clinical study when they experienced severe back pain during their labour. Once they identified a need for the sterile water injection, five minute after and every 30 minute for up to three hour. The procedure involved the intradermal injection of 0.2-0.5 ml of sterile water into four sites in the Michaelis Rhomboid or lumbar-sacral region of the spine. Two midwives simultaneously injected to reduce the number of stinging sensations experienced by women.