Table 1

Variables considered for inclusion in the model (267 patients)

Year of diagnosis*	1985–2012 (median 2005, IQR 2002–2008)
Sex*	125 (47%) female
	142 (53%) male
Age at diagnosis*	210 (79%) ≤50 years
	57 (21%) >50 years
Duration of symptoms prior to diagnosis*	174 (65%) same year
Duration of symptoms prior to diagnosis*	93 (35%) ≥1 year
Time from diagnosis to HAQ†	10–46 years (median 13 years, IQR 10–18)
History of smoking*	101 (38%) Never
	134 (50%) Current or ever
	32 (12%) Missing
Clinical mode of onset‡	3 (1%) Distal interphalangeal
	37 (14%) Monoarthritis
	56 (21%) Oligoarthritis
	46 (17%) Polyarthritis
	14 (5%) Spondyloarthritis
	111 (41%) Missing
Clinical mode of onset‡	46 (17%) Polyarthritis
	110 (42%) Other
	111 (41%) Missing
History of DMARD or anti-TNF treatment†	47 (17%) Never had DMARD/anti-TNF treatment
	159 (60%) DMARD treatment (ever)
	61 (23%) Anti-TNF treatment (ever)
Current DMARD or anti-TNF treatment†	117 (44%) Not currently on DMARD/anti-TNF treatment
	98 (37%) Current DMARD treatment
	5 (2%) Current anti-TNF treatment
	47 (17%) Missing

*Patient reported at baseline.
†Physician reported/calculated at time of HAQ.
‡Physician reported at baseline.
DMARD, disease modifying anti-rheumatic drug; HAQ, Health Assessment Questionnaire; TNF, tumour necrosis factor.