Fig. 1From: Hypnotics and injuries among older adults with Parkinson’s disease: a nested case–control designInclusion criteria and number of patients The total number of patients with PD which excluded individuals who had stayed in medical institutes or long-term care facilities before the study commencement was 8590. The final number of participants, which excluded those who had been prescribed hypnotics during the year before the study commencement, was 5009Back to article page