Table 2.
Methodological quality score of the included articles
| 1. Design and sampling method | 2. Sampling frame | 3. Sample size | 4. Objective, suitable, standard criteria | 5. Measured unbiased | 6. Response rate adequate and describing non-participants | 7. Confidence intervals | 8. Interest for this study | Total score | Quality of the study | |
|---|---|---|---|---|---|---|---|---|---|---|
| Leaver et al. (2011) | 1 | 1 | 1 | 1 | 1 | 0 | 0 | 1 | 6 | High |
| Paarup et al. (2011) | 1 | 1 | 1 | 0 | 1 | 1 | 1 | 1 | 7 | High |
| Kaufman-Cohen et al. (2011) | 1 | 1 | 0 | 1 | 1 | 0 | 0 | 1 | 5 | High |
| Zaza and Farewell (1997) | 1 | 1 | 1 | 0 | 1 | 0 | 0 | 1 | 5 | High |
| Abreu-Ramos and Micheo (2007) | 1 | 1 | 0 | 0 | 1 | 0 | 0 | 1 | 4 | Low |
| Kaneko et al. (2005) | 1 | 1 | 1 | 0 | 1 | 0 | 0 | 1 | 5 | High |
| Engquist et al. (2004) | 1 | 1 | 1 | 1 | 1 | 1 | 0 | 1 | 7 | High |
| Davies and Mangion (2002) | 1 | 1 | 1 | 0 | 1 | 0 | 0 | 1 | 5 | High |
| Roach et al. (1994) | 1 | 0 | 0 | 0 | 1 | 0 | 0 | 1 | 3 | Low |
| O’Neill et al. (2001) | 1 | 1 | 1 | 0 | 1 | 0 | 0 | 1 | 5 | High |
| Kok et al. (2013a, b) | 1 | 1 | 1 | 0 | 1 | 0 | 0 | 1 | 5 | High |
| Fishbein et al. (1988); Middlestadt and Fishbein (1988, 1989) | 1 | 1 | 1 | 0 | 1 | 0 | 0 | 1 | 5 | High |
| Ackermann et al. (2012), Kenny and Ackermann (2015) | 1 | 1 | 1 | 0 | 1 | 0 | 0 | 1 | 5 | High |
| Arnason et al. (2014) | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 2 | Low |
| Steinmetz et al. (2015) | 1 | 1 | 1 | 0 | 1 | 0 | 0 | 1 | 5 | High |
| Chimenti et al. (2013) | 1 | 1 | 1 | 0 | 1 | 0 | 0 | 0 | 4 | Low |
| Fotiadis et al. (2013) | 1 | 1 | 1 | 1 | 1 | 0 | 0 | 1 | 6 | High |