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When examining differences between age groups and over time using repeat cross-sectional data such as this, consider that some of the differences between age groups could also be due to cohort effects (as well as age effects), in addition to changes over time

The first, the self-medication hypothesis, is increasingly countered by a growing body of evidence indicating that smokers experience more severe symptoms of schizophrenia

Measurements Sociodemographics We collected data on participants age, gender, ethnicity (Chinese, Malay, Indian, others), and monthly household income in SGD ( 5) or Fishers exact test (n5)

No, smoking marijuana itself does not cause dehydration