Table 3 |
|
|
Major types of study bias in clinical research. |
|
| Bias |
Source of error |
|
|
|
| Selection bias |
Sample distorted by selection process |
| Information bias |
Misclassification of the variables |
| Confounding bias |
An extraneous variable that accounts for the observed result rather than the risk factor of interest |
Ringdal et al. Scandinavian Journal of Trauma, Resuscitation and Emergency Medicine 2009 17:66 doi:10.1186/1757-7241-17-66 |
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