Table 3

 Multivariate regression model evaluating the predictors of CRP levels in the COPD cohort

Parameter estimateSEType III SSSignificance
SE, standard error for the parameter estimate; SS, sum of squares; BMI, body mass index; FEV1, forced expiratory volume in 1 second; 6MWT, 6 minute walk test.
All of the effects were examined simultaneously (that is, the magnitude of each main effect or interaction was examined after controlling for all the other main effects and interactions).
The total sum of squares was 6.83; R2 estimate  =  0.31.
The following variables were included in the full model but excluded because they failed the significance limit (p<0.15): history of IHD, Tlco % predicted, SGRQ composite score.
Age−0.020.011.380.009
Sex−0.160.100.510.107
Pack years0.180.120.430.141
BMI0.040.012.84<0.001
FEV1 (% predicted)0.810.430.670.065
6MWT−1.140.441.290.012
COPD exacerbation history−0.160.100.520.106