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Hammer et al 12 defined CTS based on a palm-to-wrist median sensory nerve action potential onset latency of >2.0 ms or absence of SNAP and median distal motor latency of >4.9 ms whereas Sim et al 18 defined CTS as a palm to wrist median nerve latency of less than 50%. The prevalence of CTS in RA ranged from 3.5% 16 to 22.8% 17. Pooled data from 8 studies 6, 8, 9, 13, 15-17, 19 with random selection of RA patients revealed that 86 out of 1561 (5.5%) subjects had CTS. Subclinical CTS, on the other hand, had a pooled prevalence of 14.0% (30/215) (table 2).