COURTESY BY: https://www.dawn.com/ The prevalence of symptoms of depression more than tripled in the United States during the Covid-19 pandemic than before it, a study has found, highlighting the extent to which the health crisis could have a toll on mental health. The survey study published in JAMA Network Open, an open-access medical journal published by the American Medical Association, also found that people with lower incomes and those exposed to more Covid-19-related stressors were more likely to report depression symptoms than others. A survey before the pandemic involving nearly 5,000 American adults…