Table 2.

Publications describing studies included in this review (n = 20)

Author(s)	Country	Study design & focus	Sample frame: Type of ‘hidden’ population residing in the community	N and response rates
Fenta et al. 2006 [32]	Canada	Cross-sectional, mental health	Ethiopian immigrants/refugees	n = 340, response rate 85%.
Silove et al. 2007 [39]	Australia	Cross-sectional, mental health	Vietnamese refugees who have been in Australia for 10+ years	n = 1,161, response rate 82%
De Maio et al. 2014 [30] G	Australia	Longitudinal, mental health	Refugees granted residency within previous 3–6 months	n  = 2,400, response rate approximately 60%
McAuliffe 2013 [37] G-Report	Australia	Cross-sectional, health (or applicable to health)	Irregular maritime arrivals to Australia issued with a protection visa within specified timeframe	n  = 1,008, response rate 47%
Commissariat for Refugees 2008 [29] G-Report	Serbia	Cross-sectional, mental health	Refugees, predominantly from former Yugoslavia and Croatia	n  = 3,684, response rate not reported
Citizenship and Immigration Canada 2011 [28] G-Report	Canada	Cross-sectional, mental health	Refugees (Afghan 22%)	n  = 501, response rate 41%.
Cochran et al. 2013G/Ao (2016) [23]*	USA	Cross-sectional, mental health	Bhutanese refugees	n = 579, response rate 73%
Maximova & Krahn 2010 [36] G	Canada	Cross-sectional, mental health	Refugees (63% Yugoslavian)	n = 525, overall response rate (in parent study) 95%
Gerritsen et al. 2006 [33]	The Netherlands	Cross-sectional, mental health	Refugees & Asylum seekers	n = 178, response rate (for refugees) 59%
Spring et al. 2003 [40]	USA	Multiphase epidemiologic study, torture prevalence	Somalian and Oromo refugees	n = 1,165, response rate 97.1%.
Bhui et al. 2006 [24]	UK	Mix-method, mental health	Somalian refugees	n = 143, response rates 76%–83%
Bilsborrow et al. 2011 [25]	USA	Cross-sectional, wellbeing	Colombian migrants (including asylum seekers) in Ecuador	n = 234 households, response rate 76%
Blight et al. 2006 [26]	Sweden	Cross-sectional, mental health	Refugees from Bosnia-Herzegovina	n = 413, response rate 63.5%.
Heeren et al. 2012 [34]	Switzerland	Cross-sectional, mental health	Asylum seekers who arrived less than 2 years ago in Zurich	n = 126, response rate 68.3%
Khavarpour & Rissel 1997 [35]	Australia	Cross-sectional, mental health	Iranian migrants and refugees	n = 413, response rate 99% (phone) n = 161 (follow-on postal survey)
Qiu et al. 2012 [38]	China	Cross-sectional, investigating sampling & applicable to health research	Migrants in China	n = 1,270, response rate not reported
Vial et al. 2014 [18]	USA	Cross-sectional, health	Men who have sex with men	n = 3,640, response rate not reported
Wylie & Jolly 2013 [19]	Canada	Cross-sectional, health & investigating sampling	Men who have sex with men and sex workers	n = 578, response rate not reported
Bogic et al. 2012 [27] G	Germany	Cross-sectional, mental health	Refugees from former Yugoslavia	n = 854, response rate 52.9%
Dunlavy 2001 [31] G-Thesis	Sweden	Cross-sectional, mental health	African refugees and immigrants	n = 420, response rate not reported

The studies are listed based on the ranking for a representative sample: high at the top and medium at the bottom (for the specific assigned ranks, see Table 3). This table includes 17 studies focusing on refugees and asylum seekers and 3 studies focusing on another hidden group. Non-peer-reviewed publications are emphasize in bold in table. *Note that Cochran et al. [41] is a non-peer reviewed article that was identified during the grey literature search, which lead to the peer-reviewed publication by Ao et al. [23] which describes the same study

^G Identified in grey literature search. ^G-Report Government reports identified in grey literature search. ^G-Thesis Dissertations identified in grey literature search