No Recruitment From General in Patient Safety, Preventive & Ethics — Case | Epidemiology & Biostatistics | SMLE Q#18390
SMLE Question #18390
Patient Safety, Preventive & Ethics
Epidemiology & Biostatistics
Objective: OBJ-367
Last updated: February 2026
Researchers test a new oral supplement to improve nutritional status in malnourished children. Participants are recruited only from specialized malnutrition rehabilitation centers, with no recruitment from general pediatric clinics or the community. After 8 weeks, the enrolled children have a higher weight-for-height Z-score than at enrollment. Which methodological bias is most important in this study design?
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