1) Consider that, in the hypothetical study given in the table below, cases underestimated their exposure and, as a result, 20% of exposed cases were falsely classified as unexposed, however that the classification of controls was not affected.
True results of the hypothetical case-control study with no measurement error.
| | Cases | Controls | Total |
| Exposed | 300 | 250 | 550 |
| Unexposed | 100 | 150 | 250 |
| Total | 400 | 400 | 800 |
Explain whether this kind of the misclassification is random or systematic? Specify is it differential or non-differential?
b) Specify the effect it would have on the results of study?
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