Compared with women in the control group , women in the pelvic floor muscle training group increased muscle thickness ( difference between groups : 1.9 mm , 95 % confidence interval [ CI ] 1.1-2 .7 , P < .001 ) , decreased hiatal area ( 1.8 cm , 95 % CI 0.4-3 .1 , P = .026 ) , shortened muscle length ( 6.1 mm , 95 % CI 1.5-10 .7 , P = .007 ) , and elevated the position of the bladder ( 4.3 mm , 95 % CI 2.1-6 .5 , P < .000 ) and rectum ( 6.7 mm , 95 % CI 2.2-11 .8 , P = .007 ) .
