The WMH Surveys are a series of general population studies carried out throughout the world from 2001 to 2012 (Kessler & Ustun, 2008; Von Korff et al. 2009; Nock et al. 2012; Alonso et al. 2013). Respondents in the current report came from 26 WMH Surveys conducted in 24 countries, including 14 surveys from high-income countries, seven from upper-middle-income countries, and six from low-/lower-middle-income countries (Table 1). Most surveys included nationally representative household samples, although a few focused on specific urban areas or states. A total of 125 718 adults participated in the surveys. The average weighted response rate was 70.4% (range 45.9–97.2%). More details about WMH samples are reported elsewhere (Heeringa et al. 2008).
