Table 2.

Performance of the urinary pregnanediol 3-glucuronide (PDG) test with respect to its sensitivity and specificity

Rules for ovulation confirmation Total # menstrual cycles (n=22)	Menstrual cycle scenarios
	Scenario 1	Scenario 2	Scenario 3	Scenario 4
First condition	First day luteinising hormone (LH)+	Fertile peak mucus day	Third day after first LH+	Third day after peak fertile mucus day
# of cycles that met the first condition	20	17	20	17
Second condition (follows first condition)	Three consecutive daily PDG+	Three consecutive daily PDG+	1 day PDG+	1 day PDG+
# of cycles that met the second condition	17	15	19	15
False positive (# of cycles)	0	0	0	0
Sensitivity (contingent on both conditions being met) (95% CI)	85% (62 to 97)	88% (64 to 99)	95% (75 to 100)	88% (64 to 99)
Specificity (contingent on both conditions being met) (95% CI)	100% (81 to 100)	100% (78 to 100)	100% (82 to 100)	100% (78 to 100)