Dropout. Are the results of an intervention program distorted because clients drop out of treatment, leaving a different sample of persons being measured? Example: While studying the impact of...

Dropout. Are the results of an intervention program distorted because clients drop out of treatment, leaving a different sample of persons being measured? Example: While studying the impact of relocation on nursing home patients, a researcher noticed that some patients were refusing to continue to participate in the research interview because they said that the questions made them very anxious and upset. This left the overall results dependent on only the remaining patients.