A five-year prospective study of fatigue in primary Sjögren's syndrome

Table 4 Hierarchical multiple linear regression.

Independent variables	Change in fatigue measure
	FSS	Fatigue VAS	FACIT-F	Vitality
Age, Gender, Highest education	0.014	0.021	0.051	0.094*
Schirmer, UWS	0.004	0.007	0.024	0.003
Focus score, anti-SSA, anti-SSB, IgG, MH	0.058	0.071	0.012	0.025

The table shows R square change values for each group of independent variables added in the regression model. R square change values signify the proportion of the total model variance that is explained by adding each of the variable groups. UWS, unstimulated whole saliva; MH, SF-36 mental health domain. Abbreviations, see Table 1 legend. * P = 0.047.

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