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Methodological Quality Ratings of Studies Meeting Inclusion Criteria
| Author, Year | Selection Bias | Study Design | Blinding | Data Collection | DTC Definition | Overall |
|---|---|---|---|---|---|---|
| Allison-Ottey et al., 2003 | Weak | Weak | Weak | Moderate | Moderate | Weak |
| Kravitz et al., 2005 | Moderate | Strong | Strong | Strong | Strong | Strong |
| Mintzes et al., 2003 | Moderate | Moderate | Moderate | Weak | Strong | Moderate |
| Parnes et al., 2009 | Weak | Weak | Moderate | Moderate | Moderate | Weak |
