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Table 1 Description and transformation of the ACTG QOL domains

From: Quality of life and associated factors among people receiving second-line anti-retroviral therapy in Johannesburg, South Africa

Domains Items Item example Scale Transformation equation
General health perception 1 In general, would you say your health is? 1–5 (poor = 1 to excellent = 5) = (100/(5 − 1)) * (general health perception raw score − 3)
Pain 1 How much bodily pain have you had in the past 4 weeks? 1–5 (none = 1 to severe = 5) = (100/(6 − 1)) * (pain − 2)
Physical function 3 Does your health limit you are walking uphill/climbing stairs 1–3 (yes limited a lot = 1; not limited at all = 3) = (100/(9 − 3)) * (physical function raw score − 4)
Role function 2 Does your health keep you from getting a job? 1–3 (yes, all the time = 1; none of the time = 3) = (100/(9 − 3)) * (role function raw score − 2)
Social function 2 Has your physical or emotional health interfered with social activities? 1–5 (not at all = 1; extremely = 5) = (100/(8 − 2)) * (social function raw score − 2)
Cognitive function 3 Difficulty reasoning or solving problems 1–3 (all of the time = 1; none of the time = 3) = (100/(9 − 3)) * (cognitive function raw score − 3)
Mental Health 3 In the past 4 weeks, have you felt downhearted and blue? 1–3 (all of the time = 1; none of the time = 3) = (100/(18 − 3)) * (mental health raw score − 3)
Energy/fatigue 2 In the past 4 weeks, how often have you felt tired? 1–3 (all of the time = 1; none of the time = 3) = (100/(6 − 2)) * (energy/fatigue raw score − 2)