Table 2.

Constructs and measurement items.

Construct	Item	Measurement	Reference
Campaign exposure (CE)	CE1	I often browsed or heard information about Gongkuai campaign in the past 2 months	[57,58]
	CE2	I often browse or hear information about Gongkuai campaign from traditional sources (e.g., television/radio/newspaper)
	CE3	I often browse or hear information about Gongkuai campaign from social media sites (e.g., Wechat/Weibo/TikTok)
Traditional diet culture (TDC)	TDC1	I believe the shared use of chopsticks is an important traditional diet culture	[5,9]
	TDC2	Using serving chopsticks is very different from traditional customs.
	TDC3	I have a duty to uphold the traditional diet culture of dishes being shared communally
Campaign-related knowledge (CK)	CK1	I know Gongkuai campaign policy	[20,59]
	CK2	I have knowledge of how to use serving chopsticks
	CK3	I know many of the negative aspects of not using serving chopsticks
Risk perception (RP)	RP1	I worry about the danger of not using serving chopsticks	[13,20]
	RP2	It will be dangerous to dine outside if not using serving chopsticks
	RP3	Not using utensils will negatively influence my future health
Interpersonal communication (IC)	IC1	In the past two months, I have had conversation with my family or friends about Gongkuai campaign	[49,58]
	IC2	In the past two months, I have had conversations with any relevant person about Gongkuai campaign
	IC3	In the past two months, I have actively looked for chances to share my knowledge and thoughts about Gongkuai campaign