Footnote: BMI, Body mass index; PS3L, the distance from
the most inferior margin of the symphysis pubis to the midpoint of the
third sacral vertebra; b-PS3L, C-PS3L, D-PS3L, represent the
perpendicular distances from point b , C, D to PS3L; PCLpubococcygeal line; b-PCL, C-PCL, D- PCL represent the
perpendicular distances from point b, C, D to PCL. Pb’, Pc, Pdrepresent the distances from points b’, c, and d to the inferior aspect
of the pubic symphysis; Pb’/PS3, Pc/PS3, Pd/PS3 represent the
proportions of Pb’, Pc, Pd to the length of PS3L. Positive values
indicate that an anatomical landmark or angle was located above a
reference line
a Data given as median (interquartile range).b Data given as mean (± standard deviation).c The Mann-Whitney U test was used for between-group
comparisons. d The chi-square test T was used for
between-group comparisons. e The chi-square test
was used for between-group comparisons. P < .05 was considered
indicative of a significant difference.