Table 3.

Correlation coefficients (Spearman’s ρ) between effort discounting (k-values) and responses on the DAS, MDFI and MFIS.

	Effort discounting (k)
Dimensional Apathy Scale (n = 103)
Executive	0.45 (< 0.001)*
Action initiation	0.11 (0.288)
Emotional	0.31 (0.002)*
Multidimensional Fatigue Inventory (n = 74)
General	0.47 (< 0.001)*
Physical	0.27 (0.018)*
Mental	0.47 (< 0.001)*
Reduced activity	0.35 (0.002)*
Reduced motivation	0.42 (< 0.001)*
Modified Fatigue Impact Scale (n = 64)
Physical	0.45 (< 0.001)*
Cognitive	0.53 (< 0.001)*
Psychosocial	0.51 (< 0.001)*

Other than the Action Initiation subscale of the DAS, k-values were significantly positively correlated with all subscales of all inventories.

p-values are indicated in parentheses, with asterisks indicating those that survived FDR correction at a threshold of α = 0.05.