Table 4.

The sensitivity (Se), specificity (Sp), positive predictive value (PPV), negative predictive value (NPV), and confidence intervals (CI) for predicting ovulation within 24 h by the use of Peak-fertility type mucus (Score 4), luteinizing hormone test or the combination of both from days 7 to 20 of the menstrual cycle.

Scenario	Se (CI)	Sp (CI)	PPV (CI)	NPV (CI)
First day of occurrence of Score 4 mucus	0.731 (0.675–0.781)	0.773 (0.759–0.787)	0.197 (0.173–0.223)	0.974 (0.968–0.979)
Last day of occurrence of Score 4 mucus	0.284 (0.230– 0.345)	0.948 (0.940–0.955)	0.293 (0.237–0.355)	0.946 (0.937–0.953)
First day of LH ≥ 25	0.297 (0.246–0.354)	0.912 (0.902–0.920)	0.202 (0.166–0.244)	0.945 (0.937–0.952)
First day of occurrence of Score 4 mucus and LH ≥ 25	0.223 (0.177–0.276)	0.971 (0.966–0.976)	0.370 (0.300–0.446)	0.943 (0.935–0.950)
Last day of occurrence of Score 4 mucus and LH ≥ 25	0.100 (0.070–0.142)	0.986 (0.981–0.989)	0.342 (0.247–0.452)	0.936 (0.928–0.943)