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5, chest expansion (CE) (r=-.4, finger-to-floor (FFD) (r=.55), number of swollen joints (r=.69), and number of enthesitis (r=.68). The divergent validity demonstrated weak correlations between BASDAI and OWD (r=.43), MSD (r=.34), CE (r=-.44), FFD (r=.47). The divergent validity of BASFI could not be assessed due to lack of a suitable comparing parameter. The instruments revealed acceptable internal consistency as Cronbach's alpha was 0.86 for BASDAI and 0.93 for BASFI. A 7-day test-retest reliability measured by the intraclass corre