表 3. Parameters of ROC curves of post-CCT indexes in differential diagnosis of PA and EH.

CCT后各指标对PA与EH鉴别诊断的价值

Index	AUC	95%CI	Optimal cut-off value	Sensitivity/%	Specificity/%	Positive likelihood ratio	Negative likelihood ratio
PA: Primary aldosteronism; EH: Essential hypertension; ARR: Aldosterone renin activity ratio; PAC: Plasma aldosterone concentration; PRA: Plasma renin activity; CCT: Captopril challenge test; AUC: Area under curve; CI: Confidence interval. a P<0.05, vs. post-CCT ARR; bP<0.05, vs. post-CCT PAC.
Post-CCT ARR/((ng·dL−1)/(ng·mL−1·h−1))	0.860	0.800-0.907	32.47	84.17	72.41	3.05	0.22
Post-CCT PAC/(ng·dL−1)	0.881	0.825-0.924	19.24	78.40	88.10	6.61	0.25
Post-CCT PAC suppression rate/%	0.632a, b	0.558-0.701	33.40	95.20	32.20	1.40	0.15
Post-CCT PRA/(ng·mL−1·h−1)	0.771a, b	0.703-0.831	1.43	92.50	51.72	1.92	0.15