Psychological variables.—Three psychological variables (attitude, subjective
norms, and perceived behavioral control) were measured by adopting
Ajzen’s measures [30, 33–34, 38]. Sense of community was measured by
adopting an existing psychometric scale [39]. Each variable was measured
with multiple items on seven-point Likert-type scales. Multiple-item measures
are known to enhance item variability and reliability for latent psychological
variables [40].