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.

Haldorsen et al. Arthritis Research & Therapy 2011 13:R167   doi:10.1186/ar3487