Consider the method of sample recruitment in the Lodewijckx et al (2013) study and the extent to which sample bias could have affected the findings. What different recruitment strategies could have been used to improve sample representativeness?
What will be an ideal response?
ANSWERS The sample was dominated by participants from various European countries, followed by those from North America. The recommendations for a clinical pathway for patients with chronic obstructive pulmonary disease (COPD) may therefore have been influenced by the experts from these regions. There were no experts from any Asian or African countries, and only one from Australia. The researchers could have conducted a snowball sampling technique, inviting each recruited expert to nominate a colleague from a wider international pool of experts. In addition, the sample of experts was dominated by medical doctors; once again a wider pool of experts having care of COPD patients could have been sampled using a snowball technique.
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