Table 3. Reliability and construct validity of the instrument on health literacy regarding infectious respiratory diseases.

Factors	Items	Cronbach α		Eigenvalues	% of Variance
f1:internet	5(I1,I2,I3,I4,I5)	0.964		6.562	21.874
f2:oral	6(O1,O2,O3,O4,O5,O6)	0.624		2.779	9.265
f3:quantitative	4(Q1,Q2,Q3,Q4)	0.530a		6.562	4.649
f4:document	8(D1,D2,D3,D4,D5,D6,D7,D8)	0.664		1.339	4.464
f5:prose	5(P1,P2,P3,P4,P5)	0.567		1.098	3.659
f6:chart	2(Q5,Q6)			1.007	3.357
Total	30	0.864			47.268

Note: ^a, it was calculated by six items from f₃ and f₆.