Table 3.

Suggested scoring method for claims-based index of rheumatoid arthritis severity (CIRAS) by Ting, et al²⁴.

Claims-based Variables	Score
Age, continuous	–0.066
Sex	–0.092
0: male
1: female
No. inflammatory markers ordered^*	0.60
0: no
1: yes
Rehabilitation visits^*	0.69
0: no
1: yes
Rheumatoid factor test^*	2.1
0: no
1: yes
Felty’s syndrome^*	2.3
0: no
1: yes
No. platelet counts ordered^*	0.42
0: platelet count = 0
1: platelet count = 1
2: platelet count = 2
3: platelet count = 3
4: platelet count ≥ 4
No. chemistry panels ordered^*	–0.14
0: chemistry panels = 0
1: chemistry panels = 1
2: chemistry panels = 2
3: chemistry panels = 3
4: chemistry panels = 4
5: chemistry panels ≥ 5
Rheumatology visits^*	0.52
0: no. rheumatology visits = 0
1: no. rheumatology visits = 1, 2, 3, or 4
2: no. rheumatology visits > 4
Intercept	6.5

↵* Time period for which data should be recorded for these variables is 1 year. Claims-based variables shown were selected from automated modeling procedures with the rheumatoid arthritis records-based index of severity (RARBIS) as the dependent variable and potential claims-based variables as independent variables. Scores represent parameter estimates for these explanatory variables and can be used as weights when computing the CIRAS. To obtain an overall CIRAS score, multiply the value of each claims-based variable with its corresponding score and then sum all the scores and the value for the intercept.