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. Author manuscript; available in PMC: 2017 Sep 1.
Published in final edited form as: Female Pelvic Med Reconstr Surg. 2016 Sep-Oct;22(5):292–296. doi: 10.1097/SPV.0000000000000282

Table 3.

Optimal thresholds and related sensitivity and specificity for the head induced stretch ratio and the levator ani stretch ratio as predictors of delivery outcomes and severe pelvic floor trauma


Delivery Outcome		 Head Induced
Stretch Ratio
Optimal Threshold
(Se, Sp)		 Levator Ani
Stretch Ratio
Optimal Threshold
(Se, Sp)
Second Stage of Labor >90 min 2.36
(0.86, 0.50)		 7.68
(0.89, 0.46)
Assisted Delivery 2.38
(0.75, 0.58)		 7.75
(0.74, 0.51)
3rd /4thDegree Laceration 2.50
(0.74, 0.69)		 8.05
(0.84, 0.56)
Episiotomy 2.43
(0.63, 0.74)		 7.72
(0.76, 0.55)
Extreme LAD 2.33
(1.00, 0.39)		 8.86
(0.83, 0.72)