“…By self-administered online questionnaires, 981 respondents were selected by purposive sampling, with criteria they know hydroponic vegetables and have not purchased it yet. The questionnaire is developed by conducting a literature review and adaptation from previous research.There are 38 items in questionnaires to measure ten constructs that consist of 4 items of attitude [25,30,39], 3 items of subjective norm [6,25,30,39], 3 items of perceived behavioral control [25,30,39], 3 items of price [29], 6 items of perceived quality [32], 5 items of knowledge [6,29,39], 4 items of health consciousness [29,39], 3 items of availability [29], 3 items of environmental concerns [25,32], and 4 items of purchase intentions [6,30,32]. Then, we conduct multiple regression to test the hypothesis and K-means cluster analysis to identify respondents' profiles based on ten constructs.…”