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Table 4 Multivariate analysis of the factors associated with knee pain

From: Evaluation of a quantitative measurement of suprapatellar effusion by ultrasonography and its association with symptoms of radiographic knee osteoarthritis: a cross-sectional observational study

Dependent variable R 2 (adjusted) Independent variables B β P value 95 % CI
KOOS pain 0.375 Intercept 162.510 - <0.001 132.506 to 192.514
   Age −0.043 −0.021 0.780 −0.351 to 0.264
   Sex −0.617 −0.013 0.859 −7.462 to 6.228
   BMI −1.663 −0.247 0.001 −2.658 to −0.667
   KLG −6.469 −0.358 <0.001 −9.565 to −3.374
   Effusion area −0.057 −0.253 0.002 −0.092 to −0.022
KOOS symptom 0.344 Intercept 159.128 - <0.001 130.282 to 187.974
   Age −0.137 −0.070 0.361 −0.433 to 0.159
   Sex 2.378 −0.054 0.476 −8.959 to 4.203
   BMI −1.226 −0.194 0.012 −2.184 to −0.269
   KLG −5.788 −0.341 <0.001 −8.764 to −2.811
   Effusion area −0.053 −0.251 0.002 −0.087 to −0.020
KOOS ADL 0.319 Intercept 165.423 - <0.001 139.804 to 191.043
   Age −0.312 −0.184 0.020 −0.575 to −0.050
   Sex −0.189 −0.005 0.949 −6.034 to 5.656
   BMI −1.333 −0.242 0.002 −2.184 to −0.483
   KLG −4.561 −0.308 0.001 −7.204 to −1.918
   Effusion area −0.024 −0.132 0.109 −0.054 to 0.006
KOOS sports 0.424 Intercept 212.530 - <0.001 169.674 to 255.386
   Age −0.510 −0.165 0.023 −0.950 to −0.070
   Sex 1.477 0.021 0.765 −8.300 to 11.255
   BMI −2.241 −0.224 0.002 −3.664 to −0.819
   KLG −10.292 −0.382 <0.001 −14.714 to −5.871
   Effusion area −0.069 −0.205 0.007 −0.119 to −0.019
KOOS QOL 0.358 Intercept 169.047 - <0.001 128.343 to 209.751
   Age −0.133 −0.048 0.529 −0.551 to 0.284
   Sex −7.883 −0.125 0.095 −17.170 to 1.403
   BMI −1.102 −0.122 0.109 −2.453 to 0.249
   KLG −8.894 −0.367 <0.001 −13.093 to −4.694
   Effusion area −0.083 −0.276 0.001 −0.131 to −0.036
  1. Statistical analysis was by multiple linear regression analysis using each knee injury and osteoarthritis outcome score (KOOS) subscale as the dependent variable; age, sex, body mass index (BMI), Kellgren-Lawrence grade (KLG), and the suprapatellar effusion area were used as the independent variables. The effusion area and KLG values are the sum of these values for both knees. R 2 coefficient of determination, B regression coefficients, β standardized regression coefficients, sports sport and recreation, ADL activities of daily living, QOL quality of life, CI confidence interval