A set of common co-morbidities of depression were defined based on responses to single questions, as follows: Anxiety (Health Intake survey, unbranched, 2014–2015): “Have you ever been diagnosed with or treated for anxiety?” (Yes, No, I don’t know)Panic attacks (Health Intake survey, unbranched, 2014–2015): “Have you ever been diagnosed with or treated for panic attacks?” (Yes, No, I don’t know)Insomnia (Research Snippet, 2013–2016): “Do you routinely have trouble getting to sleep at night?” (Yes, No, I don’t know)Taking an SSRI (Research Snippet, 2013–2016): “Are you currently taking an SSRI (selective serotonin reuptake inhibitor) for any reason?” (options: Yes, No, I don’t know)Ever taken medication for a mental health condition; prescription sleep aids; or prescription pain medication (Health Intake survey, unbranched, 2014–2015): “Have you ever taken these medications?” “Medications to treat depression or anxiety or another mental health condition”, “Prescription sleep aids”, “Prescription pain medications” (checkbox for each category)
