Table 4.

Principal component analyses for both waves

DAS Items	DAS Item 1 factor loading on component 1 / communalities	DAS Item 2 factor loading on component 1 / communalities	DAS Item 3 factor loading on component 1 / communalities	DAS Item 4 factor loading on component 1 / communalities	Eigenvalue	% of variance
Wave 27: 2013/2014 (N = 326)	0.89 0.79	0.92 0.85	0.93 0.86	0.89 0.79	3.29	82.25
Wave 31: 2019/2020 (N = 315)	0.89 0.79	0.94 0.88	0.93 0.87	0.88 0.78	3.31	82.86

Principal component analysis for DAS items 1–4 (1. “If you had to go to the dentist tomorrow, how would you feel about it?“, 2. “When you are waiting in the dentist’s office for your turn in the chair, how do you feel?“, 3. “When you are in the dentist’s chair waiting while he gets the drill ready to begin working on your teeth, how do you feel?, 4. “You are in the dentist’s chair to get your teeth cleaned. While you are waiting and the dentist is getting out the instrument which he will use to scrape your teeth around the gums, how do you feel?”) in waves 27 (2013/2014) and 31 (2019/2020): Factor loadings on component 1, communalities, Eigenvalues and percentage of variance are reported.