Table 3.
Characteristics of the articles included in review.
| Reference | Setting | Study purpose | Target population | Final sample size (excluding fraudulent/duplicate entries, as reported) |
| Jonsson et al [22] | Stockholm county, Sweden | Generating population estimates | People with precarious employment | 595 (551) |
| Weinmann et al [26] | Munich, Germany | Generating population estimates | Individuals who have migrated from Syria | 195 (—a) |
| Oesterle et al [18] | Washington and Colorado, United States | Intervention delivery | Parents of children in grades 6-8 (ie, aged 10-14 years) | 235 (—) |
| Tran et al [30] | Vietnam | Generating population estimates | General population (youth and young adults) | 366 (356) |
| Sadasivam et al [17] | United States | Intervention delivery | Individuals who smoke | 759 (—) |
| Bourke et al [33] | New Zealand | Generating population estimates | Individuals using wheelchairs | 19 (19) |
| Hildebrand et al [32] | Perth metropolitan area, Australia | Generating population estimates | General population (youth) | 780 (—) |
| Stein et al [24] | Netherlands | Studying social networks and contact patterns relevant to the spread of infectious diseases | General population | 1448 (1429) |
| Stromdahl et al [23] | Sweden | Generating population estimates | Men who have sex with men | 148 (130) |
| Theunissen et al [27] | South Limburg, Netherlands | Intervention delivery | Young adults at risk of a Chlamydia trachomatis infection | 68 (68) |
| Bengtsson et al [31] | Vietnam | Generating population estimates | Men who have sex with men | 982 (870) |
| Crawford [21] | Oregon, United States | Generating population estimates | Individuals who use marijuana | 72 (—) |
| Stein et al [25] | Netherlands and Thailand | Studying social networks & contact patterns relevant to the spread of infectious diseases | General population | 358 (—) |
| Stein et al [28] | Thailand | Studying social networks & contact patterns relevant to the spread of infectious diseases | General population | 257 (245) |
| Bauermeister et al [19] | United States | Generating population estimates | General population (young adults) | 3448 (—) |
| Bengtsson et al [29] | Vietnam | Generating population estimates | Men who have sex with men | 676 (591) |
| Wejnert [20] | Cornell University, United States | Generating population estimates | University students | 378 (—) |
| Heckathorn and Wejnert [8] | Cornell University, United States | Generating population estimates | University students | 159 (—) |
aNot specified.