Table A1

Measurement items and their sources

ConstructMeasurement itemsReference
Knowledge sharing (KS)KS1: I frequently participated in knowledge sharing activities within the smoking cessation OHCHsu et al. (2007) 
KS2: I usually spent a lot of time in knowledge sharing activities within the smoking cessation OHC
KS3: I usually shared information with others in the smoking cessation OHC actively
KS4: I usually involved myself in discussions of various topics within the smoking cessation OHC
Commitment (CO)CO1: I was proud to belong to the smoking cessation OHCLiang et al. (2011) 
CO2: I felt a sense of belonging to the smoking cessation OHC
CO3: I cared about the long-term success of the smoking cessation OHC
Reciprocity (RE)RE1: I knew that other members would help me, so it is only fair to help other membersWasko and Faraj (2005) 
RE2: I knew that someone would help me if I were in a similar situation
Shared language (SL)SL1: The members of the smoking cessation OHC used common termsChiu et al. (2006) 
SL2: The members of the smoking cessation OHC used understandable communication patterns during discussion
SL3: The members of the smoking cessation OHC used understandable narrative forms to post messages or articles
SL4: The members of the smoking cessation OHC were always on the same frequency when we talked about smoking cessation
Shared vision (SV)SV1: Members of the smoking cessation OHC shared the vision of helping others solve their smoking problemsChiu et al. (2006) 
SV2: Members of the smoking cessation OHC shared the same goal of supporting each other
SV3: Members of the smoking cessation OHC shared the same sense that helping others was pleasant
Social ties (ST)ST1: I maintained close social relationships with some members of the smoking cessation OHCChiu et al. (2006) 
ST2: I spent a lot of time interacting with some members of the smoking cessation OHC
ST3: I knew some members of the smoking cessation OHC on a personal level
ST4: I was in frequent communication with some members of the smoking cessation OHC

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