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Table 3 Regression analyses to show univariable linear and multivariable GAM models

From: Association of lifestyle and disease characteristics with self-rated wellness/health score in patients with rheumatoid arthritis

Predictors Univariable association Multivariable model
β (95% CI) P β (95% CI) P
Age, years − 0.008 (− 0.03–0.01) 0.50 − 0.008 (− 0.03–0.01) 0.40
Sex 0.46 (− 0.23–1.16) 0.20 0.54 (− 0.29–1.26) 0.10
Disease duration, years 0.01 (− 0.02–0.04) 0.50 0.02 (− 0.01–0.03) 0.15
Mood status score − 0.05 (− 0.08–− 0.02) 0.001 − 0.04 (− 0.07–− 0.02) 0.01
Night sleep duration on weekdays 0.03 (− 0.15–0.21) 0.70 0.21 (− 0.04–0.50) 0.20
Night sleep duration on weekends − 0.06 (− 0.21–0.10) 0.50 − 0.20 (− 0.41–− 0.02) 0.03
Time to fall asleep, Minutes − 0.01 (− 0.03–− 0.001) 0.03 − 0.007 (− 0.01–0.01) 0.20
Sleep quality score EDF* = 2.10 0.0006 EDF* = 2.10 0.01
Time to go to bed on weekdays EDF* = 2.40 0.20 EDF* = 2.45 0.08
Wake-up time on weekdays EDF* = 1.32 0.80 EDF* = 1.72 0.25
Nap duration on weekdays, Minutes EDF* = 1.13 0.20 EDF* = 1.96 0.03
Nap duration on weekends, Minutes − 0.003 (− 0.01–0.006) 0.50 Removed by backward elimination
Time to go to bed on weekends EDF = 3.51 0.04
Wake-up time on weekends 0.05 (− 0.08–0.19) 0.40
Snoring − 0.027 (− 0.11–0.057) 0.55
diet score 0.006 (− 0.03–0.05) 0.80
Smoking, Pack-Years 0.01 (− 0.02–0.04) 0.60
Physical activity − 0.03 (− 0.24–0.18) 0.80
Social activity 0.06(− 0.14–0.26) 0.80
Body mass index − 0.003 (− 0.01–0.009) 0.60
Number of tender joints − 0.001 (− 0.06–0.06) 0.97
Number of swollen joints 0.01 (− 0.05–0.07) 0.70
Extra-articular manifestations − 0.02 (− 0.14–0.09) 0.70
Hemoglobin level − 0.005 (− 0.13–0.12) 0.90
C-reactive protein − 0.008 (− 0.03–0.01) 0.40
Triglyceride level − 0.001 (− 0.005–0.004) 0.80
Fasting blood sugar − 0.002 (− 0.11–0.006) 0.50
  1. The univariable outcomes presented as EDF are the products of non-linear regression models whereas β represents the linear associations. Self-rated wellness/health score was the dependent variable. p values < 0.05 are signified in bold
  2. *EDF effective degree of freedom