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A depression-screening tool would of course be an effective tool for use in the obesity clinic and would be worthwhile to employ even without any external research project being undertaken, but to have no recruitment procedures at all seems to invite the potential for a host of problems in sampling and in other aspects of research. Otherwise, however, a study-based directly on the population you are gathering for is clearly going to be an effective sample.
This leads to another issue -- a question more than a problem -- with the proposed in-clinic sampling. In such a situation, are there appropriate controls necessary to ensure a representative sample? If there are essentially no exclusionary requirements, could less accurate or somehow flawed data get through and cause the results to become skewed, even...
If these individuals are included in depression assessments alongside others with more complete records over time, will the research remain accurate?
References
Honas, J., Early, J., Frederickson, D., & O'Brien, M. (2003). Predictors of Attrition in a Large Clinic-Based Weight-Loss Program. Obesity Research 11: 888-94.
Paeratakul, S., Lovejoy, J., Ryan, D. & Bray, G. (2002). The relation of gender, race and socioeconomic status to obesity and obesity comorbidities in a sample of U.S. adults. International Journal of Obesity and Related Metabolic Disorders 26(9): 1205-10.
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