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Table 3 Risk ratios and 95 % confidence intervals for the association between educational level and having outcome measures of rheumatoid arthritis above the median

From: Higher education is associated with a better rheumatoid arthritis outcome concerning for pain and function but not disease activity: results from the EIRA cohort and Swedish rheumatology register

Visits University/college degree Outcome values above the median
No Yes Risk ratio, crude (95 % CI) Risk ratio* (95 % CI)
DAS28
 3 months No 860 (74.7) 291 (25.3) 1.0 ref. 1.0 ref.
Yes 889 (76.6) 272 (23.4) 0.95 (0.86 to 1.05) 0.99 (0.90 to 1.09)
 6 months No 762 (77.0) 227 (23.0) 1.0 ref. 1.0 ref.
Yes 776 (78.4) 214 (21.6) 0.96 (0.86 to 1.07) 1.01 (0.90 to 1.13)
 1 year No 975 (75.6) 314 (24.4) 1.0 ref. 1.0 ref.
Yes 1007 (77.4) 294 (22.6) 0.95 (0.87 to 1.04) 0.98 (0.89 to 1.08)
VAS-pain
 3 months No 817 (72.1) 316 (27.9) 1.0 ref. 1.0 ref.
Yes 948 (79.3) 247 (20.7) 0.82 (0.74 to 0.91) 0.88 (0.79 to 0.98)
 6 months No 751 (75.3) 246 (24.7) 1.0 ref. 1.0 ref.
Yes 804 (80.3) 197 (19.7) 0.86 (0.77 to 0.96) 0.93 (0.82 to 1.05)
 1 year No 947 (72.9) 352 (27.1) 1.0 ref. 1.0 ref.
Yes 1058 (80.0) 264 (20.0) 0.81 (0.73 to 0.90) 0.85 (0.76 to 0.94)
HAQ
 3 months No 743 (71.8) 292 (28.2) 1.0 ref. 1.0 ref.
Yes 986 (79.1) 261 (20.9) 0.83 (0.75 to 0.91) 0.90 (0.82 to 0.99)
 6 months No 689 (75.1) 229 (24.9) 1.0 ref. 1.0 ref.
Yes 827 (80.0) 207 (20.0) 0.87 (0.78 to 0.97) 0.93 (0.83 to 1.04)
 1 year No 817 (72.9) 304 (27.1) 1.0 ref. 1.0 ref.
Yes 1130 (79.5) 292 (20.5) 0.84 (0.77 to 0.92) 0.90 (0.82 to 0.98)
  1. Risk ratio crude: poisson regression estimates without adjustment. Risk ratio*: poisson regression estimates adjusted for age at diagnosis, gender, alcohol assumption, pack-years of smoking, body mass index, and baseline outcome values. DAS28 disease activity in 29 joints, VAS visual analog scale