Decreasing delays in the diagnosis and treatment of rheumatoid arthritis in Brazil: a nationwide multicenter observational study

Table 1 Frequencies of early RA diagnosis in Brazil according to the year of disease onset

Disease onset (year)	Delay from symptoms onset to RA diagnosis^{[a], [b]}			N*
Disease onset (year)	≤ 3 months	≤ 6 months	≤ 12 months	N*
≤ 1990	12.4%	23.6%	41.6%	161
1991–1995	10.7%	24.3%	44.7%	103
1996–2000	10.5%	25.3%	48.1%	162
2001–2005	13.9%	29.1%	57.4%	237
2006–2010	19.9%	39.1%	65.6%	256
2011–2015	20.6%	43.8%	76.9%	160

RA: rheumatoid arthritis
*Numbers of participants with data available for the analyses
^[a]The table shows the frequencies (%) of early diagnoses considering different delay thresholds (windows of opportunity)
^[b]A significant association between the year (period) of disease onset and the frequency of early RA diagnoses was observed within all considered windows, i.e., for the 3-month (p = 0.002), 6-month (p < 0.001) and 12-month (p < 0.001) delay thresholds; the Mantel–Haenszel linear-by-linear chi-squared test

ISSN: 2523-3106