Table 1.

Demographic and clinical features of rheumatoid arthritis cases at diagnosis in the Hospital Italiano Medical Care Program, Buenos Aires, Argentina, 2000–2015.

Variables	Incidence		Prevalence
Variables	Patients with Data, n	Results, n (%)	Patients with Data, n	Results, n (%)
Sex and age
Female	384	310 (81)	446	380 (85)
Diagnosis age	384	61 (14)^*	446	57 (15)^*
Actual age, by Jan. 1, 2015	384	67 (15)^*	446	66 (14)^*
Yrs from diagnosis	384	6 (4)^*	446	9 (7)^*
Laboratory
Positive RF	371	246 (66)	423	273 (65)
Positive CCP	307	244 (79)	352	278 (79)
Elevated ESR	287	225 (78)	232	183 (79)
Elevated CRP	149	99 (66)	136	90 (66)
Joint involvement^**
1 large joint	319	8 (3)	263	5 (2)
2–10 large joints	319	18 (6)	263	15 (6)
1–3 small joints	319	95 (30)	263	84 (32)
4–10 small joints	319	140 (44)	263	113 (43)
> 10 joints, ≥ 1 small joint	319	58 (18)	263	46 (17)
Other clinical presentation
Symptom duration ≥ 6 weeks	237	219 (92)	194	178 (92)
Morning stiffness ≥ 1 h	151	95 (63)	124	78 (63)
Symmetrical arthritis	285	251 (88)	230	205 (89)
Data source
Pharmacy	384	335 (87)	446	390 (87)
Electronic medical records^***	384	378 (98)	446	429 (96)
Laboratory	384	273 (71)	446	304 (68)
Rheumatology Section	384	152 (40)	446	212 (48)

↵* Presented as mean (SD).
↵** With or without involvement of large joints.
↵*** Patients are identified by keyword searches. RF: rheumatoid factor; CCP: cyclic citrullinated peptide; ESR: erythrocyte sedimentation rate; CRP: C-reactive protein.