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Scale AACTG Reasons subscale Reliability Ref Sample size 60 240 Population Patients over 18 with HIV Sampling strategy Convenience sample Results Cronbach alpha = 0.89 Adherence to refills and Medication Scale (ARMS) 26 435 Patients with coronary heart disease Not stated Cronbach alpha= 0.814 Ask 12 behaviour subscale 27 112 Not stated Brooks Medication Adherence Scale 81 263 Patients over 18 with a diagnosis of asthma, diabetes or congestive heart failure Adults with asthma Erickson 36 100 Patients with asthma Not stated Immunosuppressant Therapy Adherence Scale (ITAS) MARS 82 102 Transplant recipients Not stated Cronbach alpha=0.61 Test-retest reliability ICC= 0.67 Cronbach alpha = 0.76 Cronbach alpha = 0.8 Cronbach alpha = 0.86 Cronbach alpha=0.81 49 280 Not stated Cronbach alpha=0.78 Medication Adherence Evaluation Scale General Inquiry (Mass) Medication adherence self report inventory (MASRI) part A 83 22 Patients with schizophrenia and bipolar disorder Patients with Psychiatric disorder Not stated Cronbach alpha= 0.9 50 55 Patients over 16 with SLE Convenience Sample Cronbach alpha = 0.7 Test-retest reliability: Kappa for likert scale items =0.5 ICC for continuous (visual analogue) item = 0.93 Not stated 232 20 Morisky 4 61 400 65 260 56 377 84 420 85 153 86 93 60 240 33 319 Morisky 4 likert 33 319 Morisky 8 61 1367 Reported adherence to medication scale (RAM) 58 260 87 524 Outpatients with high blood pressure HIV infected persons over 18 attending hospital outpatient Patients who had taken an ace inhibitor or lipid lowering agent for at least 3 consecutive months Patients over 18 infected with HIV Patients over 18 with a confirmed diagnosis of Crohns disease or ulcerative colitis Random sample Not stated Cronbach alpha = 0.61 Cronbach alpha = 0.31 Not stated Cronbach alpha = 0.32 Convenience sample Convenience sample Outpatients with a psychiatric disorder other than schizophrenia, dementia, alcoholism and mental retardation Patients over 18 with HIV Home Care clients over 65 Home Care clients over 65 Patients with hypertension Not stated Cronbach alpha = 0.71 Cronbach alpha= 0.5 Intentional non adherence Cronbach alpha = 0.52. Unintentional non adherence Cronbach alpha =0.54 Cronbach alpha =0.59-0.71 HIV infected persons over 18 attending hospital outpatient clinics. Patients with asthma or diabetes, Not stated Convenience sample Random sample Random sample Random sample Not stated Cronbach alpha =0.79 Cronbach alpha = 0.42 Cronbach alpha =0.42 PCA- factors loaded onto a single factor Cronbach alpha = 0.66 Cronbach alpha = 0.6-0.83 Schneider 68 552 Simplified Medication Adherence Questionnaire (SMAQ) 71 1376 Tool for Adherence Behaviour Screening (TABS) 88 276 psychiatric patients, cardiac, general medical and renal in-patients. Patients with HIV Patients with HIV taking nelfinavir in combination with other antiretroviral drugs Patients with chronic lung conditions 20 Table 3. Reliability of self reported adherence scales Purposive sample Cronbach alpha = 0.75 Not stated Cronbach alpha=0.75 Inter observer reliability kappa= 0.74 Cronbach alpha adherence = 0.80 Cronbach alpha non adherence = 0.59 Test retest reliability: ICC Adherence = 0.78 ICC Non adherence = 0.91
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