Calculate Fatigue Severity Scale (FSS) sum score for sub component "physical fatigue"

Calculate sum score of FSS sub component "physical fatigue"

calculate_fss_sum_phys(fss_2, fss_4, fss_6)

Arguments

fss_2

vector for item "Exercise brings on my fatigue."

fss_4

vector for item "Fatigue interferes with my physical functioning."

fss_6

vector for item "My fatigue prevents sustained physical functioning."

Value

A numeric vector with sum score of FSS for sub component "physical fatigue"