Subjects: EDUCATION; STATISTICS; ACADEMIC achievement
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Subjects: MEDICAL research; POPULATION; OBSERVATION (Educational method)
Subjects: REGRESSION analysis; SOCIAL sciences; REASONING
Subjects: LUNG cancer; STATISTICS
Subjects: *SMOKING; *STATISTICS
Subjects: AGING; STATISTICS
Subjects: BLOOD cholesterol; STATISTICSUNITED States
Subjects: DRUG abuse; STATISTICSUNITED States
Subjects: ESOPHAGEAL cancer; STATISTICS; NUTRITIONUNITED Kingdom; EUROPE; FRANCE