Table 3

Results from a multivariate logistic regression model using the variables selected and defined based on the factor analysis.

VariableComparisonBp ValueOR (95% CI)Weight*
Swollen MCPPresent vs absent0.380.0031.5 (1.1 to 1.9)1.5
Swollen PIPPresent vs absent0.410.0011.5 (1.2 to 1.9)1.5
Swollen wristPresent vs absent0.48<0.0011.6 (1.3 to 2.0)1.5
Hand tendernessPresent vs absent0.59<0.0011.8 (1.3 to 2.4)2
Acute phaseModerate vs normal0.220.1721.2 (0.9 to 1.7)1
High vs normal0.520.0011.7 (1.2 to 2.3)2
SerologyModerate vs normal0.89<0.0012.2 (1.8 to 3.3)2
High vs normal1.35<0.0013.9 (3.0 to 5.0)4
  • * Variable weight approximated based on the OR of the variable in the model.

  • Definition of ‘normal’ is based on local standards and definitions of ‘moderate’ and ‘high’ are based on distributions of values below or above the median of the non-normal values.

  • MCP, metacarpophalangeal; PIP, proximal interphalangeal.