Table 3.

PCA^a factor structure.

Construct items			Factor 1 loading		Factor 2 loading
General attitudes toward vaccines
	Most vaccines do not cause immediate injuries or side effects.	0.79		0.13
	Most vaccines do not lead to long-term side effects.	0.69		0.11
	Vaccines cause more harm than benefit.	0.09		0.74
	Taking a vaccine is likely to give me a disease.	0.09		0.75
	Vaccination can protect me from getting a disease.	0.49		0.10
	Vaccines cause autism.	0.19		0.75
	Vaccines are designed as a form of government control.	0.14		0.66
Recognize
	Scary music	0.78		N/Ab
	Weird colors	0.78		N/A
	Vague language (words that are unclear or not specific)	0.73		N/A
Sharing
	How likely are you to share this second video with people in your social media network?	0.83		N/A
	How likely are your friends to share this second video on their social media networks?	0.81		N/A
	If you could, how likely would you be to support the producer of this second video by following them (receiving future posts from them) on social media?	0.88		N/A
	If you could, how likely would you be to financially support the producer of this second video?	0.82		N/A
	How likely are you to check the facts on the second video you just watched?	0.60		N/A

^aPCA: principal component analysis.

^bN/A: not applicable.