“…Of the 9 studies querying NDS efficacy for symptom management, an average of 47% of patients (range 21%-73%) found NDS to be effective (15,16,21,25,26,28,29,31,33). Of the 7 studies that asked patients if they informed their health care providers about NDS use (16,22,24,26,28,29,33), the average prevalence of reported NDS usage was 30% (range 4%-70%). A total of 7 studies (15,16,18,21,28,29,33) demonstrated the prevalence of patients experiencing adverse effects, with an average prevalence rate of 13% (range 4%-24%).…”