Table 1. Definitions of duration of type-specific hr-HPV detection.

	Study sample month
Type-specific hr-HPV history	Month 0	Month 6	Month 12*	Month 18	Month 24	Type-specifc hr-HPV during 2nd study year
Detected since baseline	+	+	+
	+	−	+
Detected since study month 6	−	+	+
Newly detected at study month 12	−	−	+
				−	−	Clearance
				+	−	Persistence
				+	+
				−	+

*only women positive for hr-HPV at sample month 12 are included in the 2^nd study year and in the analysis of HPV persistency.