After every three months , cognitive functions were assessed by determining the mini mental state examination ( MMSE ) score , digital symbol substitution ( DSS ; subtest of the Wechsler Adult Intelligence Scale-Revised ) , immediate and delayed word recall ( digital memory apparatus-Medicaid systems , Chandigarh , India ) , attention span ( Attention Span Apparatus-Medicaid systems , Chandigarh , India ) , functional activity questionnaire ( FAQ ) and depression ( geriatric depression scale ) scores .