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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)