Concomitant use of psychotropic medications
Psychotropic medications were allowed to be prescribed at the discretion of psychiatrists and general physicians during study. The proportion of participants who were prescribed with sleeping medications (sedatives, hypnotics and anxiolytics), dosage and weekly frequency of use were recorded. The dosage used was converted as diazepam equivalent dosage. Four mean dosages were obtained by averaging across a 2 week duration [