Table 2.

Perceptions related to COVID-19 vaccination and preventive measures taken up by participants and the factories they were working in (N=2053).

Perceptions			Participants, n (%)		Mean (SD)
Behavioral intention to take up COVID-19 vaccination
	Intention to get COVID-19 vaccines conditional on 50% efficacy and market rate (¥1000 or US $140)					N/Aa
		Very unlikely		222 (10.8)
		Unlikely		208 (10.1)
		Neutral		524 (25.5)
		Likely		543 (26.4)
		Very likely		556 (27.1)
	Intention to get COVID-19 vaccines conditional on 80% efficacy and market rate (¥1000 or US $140)					N/A
		Very unlikely		155 (7.5)
		Unlikely		147 (7.2)
		Neutral		383 (18.7)
		Likely		639 (31.1)
		Very likely		729 (35.5)
	Intention to get COVID-19 vaccines conditional on 50% efficacy and free vaccines					N/A
		Very unlikely		108 (5.3)
		Unlikely		98 (4.8)
		Neutral		296 (14.4)
		Likely		453 (22.1)
		Very likely		1098 (53.5)
	Intention to get COVID-19 vaccines conditional on 80% efficacy and free vaccines					N/A
		Very unlikely		117 (5.7)
		Unlikely		77 (3.8)
		Neutral		204 (9.9)
		Likely		320 (15.6)
		Very likely		1335 (65.0)
Perceptions related to COVID-19 vaccination based on the theory of planned behavior
	Positive attitudes toward COVID-19 vaccination			N/A
		Positive Attitude Scaleb				13.3 (2.3)
	Negative attitudes toward COVID-19 vaccination			N/A
		Negative Attitude Scalec				8.0 (1.9)
	Perceived subjective norm related to COVID-19 vaccination			N/A
		Perceived Subjective Norm Scaled				5.1 (1.2)
	Perceived behavioral control to receive COVID-19 vaccination			N/A
		Receiving COVID-19 vaccination is easy for you if you want to				2.3 (0.7)
Influence of social media related to COVID-19 vaccination
	Frequency of exposure to positive information related to COVID-19 vaccination (eg, new vaccines entering clinical trials, promising efficacies of the vaccines, and vaccines will enter the market soon) on social media			N/A		2.8 (1.0)
	Frequency of exposure to negative information related to COVID-19 vaccination (eg, concerns about efficacies and supplies, side effects of the vaccines, and receiving vaccines will cause COVID-19) on social media			N/A		2.3 (0.9)
	Frequency of exposure to testimonials given by participants of the COVID-19 vaccine clinical trials on social media			N/A		1.9 (1.0)
	Frequency of exposure to negative information about other vaccines in China (eg, selling problematic vaccines and severe side effects) on social media			N/A		2.0 (1.0)
Personal COVID-19 preventive measures in the past month
	Frequency of wearing a face mask in public places/transportation other than the workplace					N/A
		Every time		1675 (81.6)
		Often		280 (13.6)
		Sometimes		82 (4.0)
		Never		16 (0.8)
	Frequency of wearing a face mask when you have close contact with other people in the workplace					N/A
		Every time		1519 (74.0)
		Often		370 (18.0)
		Sometimes		144 (7.0)
		Never		20 (1.0)
	Self-reported sanitizing hands (using soaps, liquid soaps, or alcohol-based sanitizer) after returning from public spaces or touching public installation					N/A
		Every time		1217 (59.3)
		Often		495 (24.1)
		Sometimes		323 (15.7)
		Never		18 (0.9)
	Self-reported avoiding social gatherings with other people who do not live together					N/A
		No		1165 (56.7)
		Yes		888 (43.3)
	Self-reported avoiding crowded places					N/A
		No		1309 (63.8)
		Yes		744 (36.2)
Number of preventive measures implemented by the factory			N/A		6.1 (2.5)

^aN/A: not applicable.

^bPositive Attitude Scale, 5 items, Cronbach alpha: .84; 1 factor was identified by exploratory factor analysis, explaining for 54.0% of total variance.

^cNegative Attitude Scale, 4 items, Cronbach alpha: .67; 1 factor was identified by exploratory factor analysis, explaining for 50.9% of total variance.

^dPerceived Subjective Norm Scale, 2 items, Cronbach alpha: .85.