Marco
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That would be interesting, but what I was really hoping for was something that looked at possible bias where trial participants had a strong relationship with a therapist, and might be, subconsciously or otherwise, boosting their score a little. I've not seen anything like that to date.
Here's the link and relevant extract.
http://www.cfids-cab.org/cfs-inform/Ptsd/mccue.etal06.pdf
Screening for psychological distress using internet administration of the Hospital Anxiety and Depression Scale (HADS) in individuals with chronic fatigue syndrome
However, the control group were observed to demonstrate significantly higher levels of HADS-assessed anxiety and depression compared with
normative control data (Crawford et al., 2001). This provides some support for Buchanans (2003) observation that Internet-based data collection (in the HADS and other instruments) may produce inflated scores due to the testing medium. It is possible that anonymous Internet administration results in increased self-disclosure or reduced socially desirable responding, and that Internet questionnaires may thus provide inflated estimates of levels of negative affect experienced by respondents. An alternative possibility is that the control group may represent a biased sample. Simply choosing to take part in an on-line personality test, which while not expressly reporting a formal diagnoses, may be suggestive of greater levels of underlying psychopathology.
This would suggest that internet delivery might reduce the effects of social desirability bias and encourage more frank disclosure. On the other hand its difficult to tell what other biases might be introduced. People behave strangely on the 'net'. The may also behave differently when someone has their e-mail address.