International Journal of Rheumatology / 2018 / Article / Tab 4

Research Article

Work Ability and Employment in Rheumatoid Arthritis: A Cross-Sectional Study on the Role of Muscle Strength and Lower Extremity Function

Table 4

Associations between grip strength, knee extensor strength, lower extremity function, and workability (workability index single item, WAS).

Workability (WAS)
Handgrip strength (HGS)Knee extensor strength (KES)Short physical performance battery score (SPPB)
ModelVariableR2βp-valueR2βp-valueR2βp-value

IHGS/KES/SPP0.060.250.0120.170.39<0.0010.330.57<0.001
IHGS/KES/SPP0.310.49<0.0010.330.52<0.0010.390.50<0.001
Age - years-0.210.024-0.140.132-0.190.040
Gender (female)0.390.0010.350.0010.050.520
Education (higher)0.170.0640.170.0540.140.118
IIHGS/KES/SPP0.450.250.0390.450.360.0010.510.35<0.001
Age - years-0.150.107-0.090.319-0.140.132
Gender (female)0.240.0320.260.0060.060.469
Education (higher)0.060.4710.080.3280.060.505
Disease duration - months-0.130.189-0.740.391-0.060.511
sDMARD therapy-0.070.457-0.100.2390.080.317
Comedication-0.170.193-0.210.104-0.160.217
Comorbidity0.060.6510.070.5890.050.710
Pain (VAS) - points-0.36< 0.001-0.34< 0.001-0.39<0.001

Linear regression analysis. β=standardised beta coefficient, HGS=handgrip strength, KES=knee extensor strength, SPPB=short physical performance battery, and s/b DMARD=synthetic/biological disease-modifying antirheumatic drug.
kg HGS/KES; per point of the SPPB score; II adjusted for sociodemographic variables p≤0.02 in univariate analysis; adjusted for sociodemographic and clinical variables p≤ 0.2 in univariate analysis.

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