Recruitment
Hewson et al. (2002) review the methodology of the TBT and note a disproportionate number of centers (61) in the English-speaking industrialized world versus the non-industrialized third world (27). However, over half (1161) of the individuals participating in the study come from the developing world. This suggests the English speaking countries had difficulty recruiting participants and needed additional sites to increase their numbers. The difficulty in recruiting participants in English speaking countries suggests the participants may not be representative of the target population, therefore results must be interpreted with caution.
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