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Table 2 Examples for the hierarchical structure of the ICF [24]

From: Comparing the contents of patient-reported outcome measures for fatigue: EORTC CAT Core, EORTC QLQ-C30, EORTC QLQ-FA12, FACIT, PRO-CTCAE, PROMIS, Brief Fatigue Inventory, Multidimensional Fatigue Inventory, and Piper Fatigue Scale

Domain

Code

Title

Description

Component

b

Body functions

 

First level (chapter)

b4

Functions of the cardiovascular, haematological and respiratory systems

This chapter is about the functions involved in the cardiovascular system (functions of the heart and blood vessels), the haematological and immunological systems (functions of blood production and immunity), and the respiratory system (functions of respiration and exercise tolerance).

Second level

b455

Exercise tolerance functions

Functions related to respiratory and cardiovascular capacity as required for enduring physical exertion.

Third level

b4552

Fatiguability

Functions related to susceptibility to fatigue, at any level of exertion.

Component

b

Body functions

 

First level (chapter)

b1

Mental functions

This chapter is about the functions of the brain: both global mental functions, such as consciousness, energy and drive, and specific mental functions, such as memory, language and calculation mental functions.

Second level

b130

Energy and drive functions

General mental functions of physiological and psychological mechanisms that cause the individual to move towards satisfy specific needs and general goals in a persistent manner.

Third level

b1300

Energy level

Mental functions that produce vigour and stamina.

Component

d

Activities and Participation

 

First level (chapter)

d2

General tasks and demands

This chapter is about general aspects of carrying out single or multiple tasks, organizing routines and handling stress. These items can be used in conjunction with more specific tasks or actions to identify the underlying features of the execution of tasks under different circumstances.

Second level

d230

Carrying out daily routine

Carrying out simple or complex and coordinated actions in order to plan, manage and complete the requirements of day-to-day procedures or duties, such as budgeting time and making plans for separate activities throughout the day.

Third level

d2301

Managing daily routine

Carrying out simple or complex and coordinated actions in order to plan and manage the requirements of day-to-day procedures or duties.