表 4. Parameters of ROC curves of post-CCT indexes in differential diagnosis of PA and LREH.

CCT后各指标对PA与LREH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; LREH: Low renin primary 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))	0.677	0.594-0.754	110.73	52.50	85.71	3.67	0.55
Post-CCT PAC/(ng·dL−1)	0.903a	0.843-0.946	18.17	83.20	90.48	8.74	0.19
Post-CCT PAC suppression rate/%	0.629b	0.546-0.708	33.36	95.20	33.33	1.43	0.14
Post-CCT PRA/(ng·mL−1·h−1)	0.511a, b	0.425-0.596	0.58	73.33	9.52	0.81	2.80