. 2011 Jan 11;183(1):73–76. doi: 10.1503/cmaj.090195

Table 1:

Sensitivity and specificity of the Clearblue Easy and Persona fertility monitors in identifying the fertile phase

Event predicted	Clearblue Easy Fertility Monitor		Persona
Event predicted	Sensitivity	Specificity	Sensitivity	Specificity
Onset of fertility	Results pending⁹	Results pending⁹	94%⁶	96%⁶

Ovulation	97%⁷	100%⁷	95.8%⁶	Not calculated⁶