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Table 4 Multiple linear regression analysis of 4 modelsa of demographic and illness perceptions by SF-36 HRQoL dimensionsb

From: Effects of illness perceptions on health-related quality of life in patients with rheumatoid arthritis in China

  PF RP BP GH VT SF RE MH Total SF-36
Model 1
R2 0.203 0.049 0.142 0.068 0.156 0.101 0. 035 0.108 0.171
Age − 0.369; < 0.001;
[− 1.104 to − 0.525]
− 0.149; 0.032;
[− 0.565 to − 0.031]
− 0.158; 0.029;
[− 0.461 to − 0.030]
− 0.225; 0.001;
[− 0.597 to − 0.125]
− 0.185; 0.009;
[− 0.781 to − 0.111]
− 0. 187; 0.009;
[− 1.001 to − 0.143]
− 0.237; 0.001;
[− 5.016 to − 1.393]
Education c          
Senior middle school 0.183; 0.007;
[3.483 to 18.494]
0.198; 0.005;
[3.414 to 18.571]
0.159; 0.019;
[11.541 to 127.202]
College
Occupation d          
Blue collar
White collar 0.196;0.004;
[3.87 to 19.599]
0.222; 0.002;
[6.132 to 27.037]
0.318; < 0.001;
[8.738 to 23.374]
0.178; 0.014;
[0.653 to 12.464]
0.258; < 0.001;
[6.313 to 19.104]
0.225; 0.002;
[5.578 to 23.749]
0.285; < 0.001;
[6.890 to 19.604]
0.281; < 0.001;
[53.764 to 152.4]
Model 2
R2 0.646 0.270 0.700 0.317 0.437 0.524 0.210 0.284 0.650
Age − 0.143; 0.003;
[− 0.522 to − 0.112]
− 0.113; 0.010;
[0.054 to 0.393]
Education c          
Senior middle school 0.105; 0.017;
[1.330 to 13.648]
0.159; 0.004;
[2.869 to 15.058]
0.111; 0.029;
[0.917 to 16.375]
0.198; 0.002;
[4.182 to 18.795]
0.136; 0.002;
[22.304 to 96.643]
College
Occupation d          
Blue collar
White collar 0.099; 0.021;
[0.811 to 9.872]
0.146; 0.027;
[0.801 to 12.817]
DAS28 − 0.738; < 0.001;
[− 18.498 to − 14.381]
− 0.520; < 0.001;
[− 18.823 to − 11.017]
− 0.822; < 0.001;
[− 18.175 to − 14.642]
− 0.563; < 0.001;
[− 10.541 to − 6.872]
− 0.647; < 0.001;
[− 13.274 to − 9.475]
− 0.720; < 0.001;
[− 18.154 to − 10.259]
− 0.459; < 0.001;
[− 19.864 to − 15.047]
− 0.442; < 0.001;
[− 9.857 to − 5.419]
− 0. 800; < 0.001;
[− 120.414 to − 97.248]
Model 3
R2 0.670 0.305 0.722 0.425 0.499 0.573 0.266 0.314 0. 728
Age − 0.132; 0.004;
[− 0.491 to − 0.094]
0.126; 0.003;
[0.086 to 0.413]
Education c          
Senior middle school 0.103; 0.016;
[1.410 to 13.327]
0.112; 0.046;
[0.111 to 10.981]
0.157; 0.003;
[3.116–14.642]
0.110; 0.023;
[1.196 to 15.889]
0.182; 0.003;
[3.466 to 16.715]
0.135; 0.001;
[25.888 to 91.587]
College
Occupation d          
Blue collar
White collar 0.086; 0.038;
[0.267 to − 9.002]
DAS28 − 0.630; < 0.001;
[− 16.399 to − 11.670]
− 0.386; < 0.001;
[− 14.810 to − 6.631]
− 0.714; < 0.001;
[− 16.227 to − 12.289]
− 0.347; < 0.001;
[− 7.447 to − 3.287]
− 0.469; < 0.001;
[− 10.447 to − 6.036]
− 0.563; < 0.001;
[− 16.446 to − 10.843]
− 0.291; < 0.001
[− 13.914 to − 4.597]
− 0.330; < 0.001;
[− 8.228 to − 3.157]
− 0.600; < 0.001;
[− 94.286 to − 69.142]
Overall BIPQ − 0.193; < 0.001;
[− 0.785 to − 0.241]
− 0.230; 0.002;
[− 1.250 to − 0.273]
− 0.215; < 0.001;
[− 0.739 to − 0.287]
− 0.379; < 0.001;
[− 0.948 to − 0.451]
− 0.307; < 0.001;
[− 0.908 to − 0.381]
− 0.270; < 0.001;
[− 1.118 to − 0.446]
− 0.290; < 0.001;
[− 1.722 to − 0.597]
− 0.272; < 0.001;
[− 0.864 to − 0.259]
− 0.343; < 0.001;
[− 7.080 to − 4.077]
Model 4
R2 0.673 0.298 0.718 0.434 0.518 0.578 0.269 0.378 0. 740
Age − 0.145; 0.002;
[− 0.541 to − 0.147]
0.129; 0.003;
[0.090 to 0.421]
Education c          
Senior middle school 0.105; 0.014;
[1.643 to 13.420]
0.113; 0.042;
[0.218 to 11.024]
0.158; 0.002;
[3.222 to 14.594]
0.111; 0.021;
[1.312 to 15.947]
0.168; 0.004;
[2.954 to 15.707]
0.139; < 0.001;
[28.238 to 93.028]
College
Occupation d          
Blue collar
White collar 0.091; 0.030;
[0.480 to 9.293]
DAS28 − 0.699; < 0.001;
[− 16.748 to − 12.129]
− 0.415; < 0.001;
[− 15.455 to − 7.571]
− 0.742; < 0.001;
[− 16.743 to − 12.895]
− 0.397; < 0.001;
[− 8.103 to − 4.158]
− 0.460; < 0.001;
[− 10.256 to − 5.935]
− 0.589; < 0.001;
[− 16.971 to − 11.627]
− 0.341; < 0.001;
[− 14.983 to − 6.082]
− 0.274; < 0.001;
[− 7.086 to − 2.415]
− 0.610; < 0.001;
[− 95.423 to − 70.438]
BIPQ–1 Consequences − 0.135; 0.032;
[− 1.989 to − 0.087]
BIPQ–3 Personal control 0.169; < 0.001;
[0.780 to 2.781]
0.086; 0.038;
[0.052 to 1.746]
0.225; < 0.001;
[0.910 to 2.751]
0.134; 0.014;
[0.263 to 2.214]
0.138; 0.006;
[0.515 to 3.008]
0.119; 0.004;
[2.857 to 14.194]
BIPQ–4 Treatment control 0.139; 0.027;
[0.273 to 4.644]
0.084; 0.029;
[0.640 to 12.391]
BIPQ–5 Identity − 0.198; 0.007;
[− 4.557 to − 0.751]
− 0.146; 0.002;
[− 2.308 to − 0.508]
− 0.105; 0.034;
[− 13.159 to − 0.430]
BIPQ–7 Coherence 0.127; 0.033;
[0.079 to 2.134]
BIPQ–8 Emotional response − 0.232; < 0.001;
[− 2.488 to − 0.717]
− 0.180; 0.006;
[− 2.387 to − 0.405]
− 0.193; 0.001;
[− 3.276 to − 0.877]
− 0.224; 0.002;
[− 5.061 to − 1.106]
− 0.390; < 0.001;
[− 4.010 to − 1.940]
− 0.207; < 0.001;
[− 18.334 to − 6.811]
  1. SF-36 abbreviations: BP, bodily pain; GH, general health; MH, mental health; PF, physical function; RE, role limitations due to emotional problems; RP, role limitations related to physical problems; SF, social functioning
  2. aThe SF-36 dimensions reflecting HRQoL were treated as dependent variables
  3. The selection of independent variables for multiple regression analyses was based on these analyses (Tables 2 and 3). Model 1, demographic variables (gender, age, education, type of residence, family income, employment)
  4. Model 2, Model 1 + clinical characteristic variables (disease duration, DAS28); Model 3, Model 2 + overall BIPQ; Model 4, Model 2 + the 8 BIPQ domains without the overall BIPQ
  5. bReported as: β; P, 95% CI, unless indicated otherwise
  6. Dummy Variables: c Reference as junior middle school; d Reference as unemployed