Yiengprugsawan, VasoontaraSomboonsook, BoonchaiSeubsman, Sam-angSleigh, Adrian2015-12-101389-4978http://hdl.handle.net/1885/52556Research on happiness has been of interest in many parts of the world. Here we provide evidence from developing countries; this is the first analysis of happiness among a cohort of Thai distance learning adults residing throughout the country (n = 60,569Keywords: Cohort study; Happiness; Mental health; Subjective well-being; Thailand201110.1007/s10902-011-9304-42016-02-24