Table 2.

Multivariate logistic regression results for the risk of SCAD.

	B	SE	Wald	P value	HR	95% CI
Hypertension (n, %)	0.787	0.437	3.242	0.072	2.196	0.933–5.171
Gensini score	0.406	0.076	28.480	0.000	1.501	1.293–1.743
HRR1 (bpm)	0.047	0.024	3.854	0.050	1.048	1.000–1.099
HRR1 ≤24 bpm (n, %)	0.857	0.408	4.415	0.036	2.356	1.059–5.238
HRR2 (bpm)	0.045	0.021	4.530	0.033	1.046	1.004–1.091
HRR2 ≤42 bpm (n, %)	0.754	0.412	3.342	0.068	2.126	0.947–4.771
HRR3 (bpm)	0.050	0.021	5.378	0.020	1.052	1.008–1.096
HRR4 (bpm)	0.042	0.023	3.437	0.064	1.044	0.998–1.092
HRR5 (bpm)	0.027	0.021	1.626	0.202	1.028	0.985–1.071
SDNN (ms)	0.011	0.007	2.061	0.151	1.011	0.996–1.026
RMSSD (ms)	0.098	0.033	8.781	0.003	1.104	1.034–1.178
pNN50 (ms)	0.144	0.055	6.845	0.009	1.155	1.036–1.285
VLF (ms)	0.095	0.034	7.953	0.005	1.100	1.029–1.175
LF (ms)	0.113	0.048	5.575	0.018	1.236	1.019–1.23
HF (ms)	0.212	0.075	8.062	0.005	1.236	1.067–1.431

Abbreviations: SCAD, stable coronary artery disease; HR, hazard ratio; CI, confidence interval; HRR, heart rate recovery; HRRn, heart rate recovery at n minutes post-exercise; SDNN, standard deviation of NN intervals; RMSSD, root mean square of successive differences; pNN50, the proportion derived by dividing the number of interval differences of successive NN intervals greater than 50 ms by the total number of NN intervals; VLF, very-low-frequency power; LF, low-frequency power; HF, high-frequency power.