Calculate Fatigue Severity Scale (FSS) sum score for sub component "general and mental fatigue"

Source: R/primary-coding.R

Calculate sum score of FSS sub component "general and mental fatigue"

calculate_fss_sum_mental(fss_1, fss_3, fss_5, fss_7, fss_8, fss_9)

Arguments

fss_1

vector for item "My motivation is lower when I am fatigued."

fss_3

vector for item "I am easily fatigued."

fss_5

vector for item "Fatigue causes frequent problems for me."

fss_7

vector for item "Fatigue interferes with carrying out certain duties and responsibilities."

fss_8

vector for item "Fatigue is among my three most disabling symptoms."

fss_9

vector for item "Fatigue interferes with my work, family or social life."

Value

A numeric vector with sum score of FSS for sub component "general and mental fatigue"