(AUGUST 16, 2019) A new Iowa Department of Public Health (IDPH) study, Gambling Attitudes and Behaviors: A 2018 Survey of Adult Iowans, estimates over 1.7 million (73.8%) adult Iowans gambled during the past 12 months. Of that number, about 315,000 (13.6%) are classified as “at-risk,” meaning they are experiencing some symptoms of problem gambling.