Table 2.

Single-Items Missing Values by Mode of Measurement Model and Time

Model	Point of measurement	Description	Average missing values
			Hernia	Gall
Conventional, Subgroup A	T0	Measured directly	23,8%	20,8%
Conventional, Subgroup B	T0	Measured directly	24,2%	40,7%
A	T0	Perceived at T1	23,5%	33,3%
B	T0	Recalled at T1	7,9%	8,4%
A	T0	Perceived at T2	26,9%	33,3%
B	T0	Recalled at T2	8,9%	10,7%
A	T1	Measured directly	6,8%	10,7%
B	T1	Measured directly	11,1%	29,1%
A	T2	Measured directly	7,1%	9,3%
B	T2	Measured directly	14,9%	11,6%