How SAD Was Measured

Let’s take a look at the study that concluded SAD was folklore. The researchers used data from the 2006 Behavioral Risk Factor Surveillance System questionnaire (BRFSS 2006). This is a telephone survey conducted every year in the US. In 2006, over 34,000 people responded to the phone survey. The survey varies from 199 questions for the short version and up to 373 questions for the full survey. The phone numbers are generated at random and reflect the population distribution of the US.

Because the survey is given throughout the year, all areas in the U.S. will be . . .

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