Inclusion criteria are usually based on the study’s objectives and the characteristics of the population being investigated. Common factors include:
Demographic Factors: Age, gender, ethnicity, and socioeconomic status may be considered. Clinical Characteristics: Specific medical conditions, stages of disease, and biomarkers are often used as criteria. Behavioral Factors: Lifestyle variables, such as smoking status or physical activity levels, may be relevant. Geographical Location: Residency in a particular area or environment might be required.
