| Our study 2011 | Utman et al., 2011 | Sushil et al., 2005 | Chattopdhya et al., 2011 | Endrikat et al., 2009 | Kaunitz et al., 2010 | Reid et al., 2005 | |
| Continuation rate | 88.58% | 80% | 95% | 88.1% | 95% | 95% | 84% |
| Satisfaction rate | 94.54% | 80% | 96.3% | 85% | 85% | 82% |