Table 2.
Study characteristics.
| Reference | Study design | Sample characteristics | Age range (y); mean (y) | Data collection period | Country | Patients (n) | m/f (%) | Extractions (n) | Risk of bias* |
|---|---|---|---|---|---|---|---|---|---|
| Chrysanthakopoulos, 2011a | Prospective, cross-sectional (questionnaires and clinical examination) | Mean number of 20 natural teeth, with good general health, who attended a private practice | range 18-76, mean 44.6 ± 5.8 | Aug 2007-July 2010 | Greece | 632 | 53.8:46.2 | 1688 | 6 |
| Chrysanthakopoulos, 2011b | Prospective, cross-sectional (questionnaires and clinical examination) | Mean number of 20 natural teeth, with good general health, who attended a private practice | range 18-74, mean 42.6 ± 5.8 | June 2004-May 2009 | Greece | 1018 | 55.0:45.0 | 2462 | 7 |
| Plančak et al, 2004 | Retrospective, cross-sectional (data from dental records) | Civilian population during war | range 18-59 | 1995 | Croatia | 246 | 246 | 7 |
*Risk of bias13: 0-3 low; 4-6 moderate; 7-9 high.