Table 4. Differences in predictive values according to subgroup RNS test in Cox proportional-hazards models.

Variable	Abnormal response in OO or NA		Abnormal response in TR, FCU, or ADM		Abnormal response in FCU or ADM
	p	HR (95% CI)	p	HR (95% CI)	p	HR (95% CI)
Titer of AChR antibody	0.005	1.14 (1.04–1.25)	0.053		0.046	1.09 (1.01–1.18)
Prednisolone use	0.111		0.396		0.364
Subgroup RNS test	0.364		<0.001	5.08 (2.07–12.52)	<0.001	5.19 (2.09–12.90)

AChR: acetylcholine receptor, ADM: abductor digiti minimi, CI: confidence interval, FCU: flexor carpi ulnaris, HR: hazard ratio, NA: nasalis, OO: orbicularis oculi, RNS: repetitive nerve stimulation, TR: trapezius.