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. Author manuscript; available in PMC: 2014 Jan 6.
Published in final edited form as: J Rheumatol. 2011 Jul;38(7):10.3899/jrheum.110272. doi: 10.3899/jrheum.110272

Table 2.

Properties of the Vernier caliper method according to the OMERACT filter.

Findings Data source Reference
Feasibility Low cost, short acquisition time, high patient acceptability. Observational cross-sectional study (16)
Construct validity High correlation between computed tomography and Vernier caliper measurement (r=0.91, p<0.001). Observational cross-sectional study (16)
Reliability Intra-observer intraclass correlation coefficient 1.0 (95% CI 0.99, 1.0); inter-observer intraclass correlation coefficient 0.99 (95% CI 0.97, 0.99). Observational cross-sectional study (16)
Change sensitivity All index tophi completely resolved with urate lowering therapy after mean of 21 months; effect size 1.83. Non-randomised parallel treatment study (12)
Between group discrimination Faster resolution in benzbromarone treatment group compared to allopurinol treatment group (velocity of regression 1.21 mm/month vs. 0.57 mm/month, p<0.01). Non-randomised parallel treatment study (12)