Table 1. Baseline characteristics of study participants*.
| Characteristics | XXK group (N = 366) | CDS group (N = 367) | P value |
|---|---|---|---|
| Sex — no. (%) | 0.6696 | ||
| Male | 113(30.87) | 108(29.43) | |
| Female | 253(69.13) | 259(70.57) | |
| Age (yr) | 58.05 ± 7.75 | 58.22 ± 7.36 | 0.7597 |
| Prior treatment for angina—No. (%) | 0.3004 | ||
| Yes | 183(50.00) | 197(53.68) | |
| No | 183(50.00) | 170(46.32) | |
| Concomitant disease—No. (%)† | 0.5979 | ||
| Yes | 81(22.13) | 87(23.71) | |
| No | 285(77.87) | 280(76.29) | |
| Mean pulse rate (bpm)£ | 70.20 ± 8.65 | 71.62 ± 8.77 | 0.0285‡ |
| Systolic pressure (mmHg) | 124.34 ± 8.77 | 125.56 ± 8.65 | 0.0573 |
| Diastolic pressure (mmHg) | 76.64 ± 6.39 | 77.05 ± 6.86 | 0.3969 |
| Weekly angina frequency | 6.95 ± 3.99 | 6.94 ± 3.78 | 0.9549 |
| CCS angina class—No. (%)§ | 0.8659 | ||
| I | 104(28.42) | 102(27.79) | |
| II | 247(67.49) | 250(68.12) | |
| III | 15(4.10) | 15(4.09) | |
| Weekly nitroglycerin use | 1.81 ± 3.08 | 1.75 ± 2.9 | 0.9816 |
| SAQ score§ | |||
| Angina frequency | 54.62 ± 19.70 | 54.39 ± 19.09 | 0.8722 |
| Physical limitation | 68.90 ± 16.35 | 69.80 ± 16.52 | 0.4579 |
| Angina stability | 41.67 ± 18.47 | 42.78 ± 17.60 | 0.4041 |
| Treatment satisfaction | 49.47 ± 17.57 | 49.91 ± 16.71 | 0.7252 |
| Quality of life | 40.57 ± 17.41 | 41.42 ± 16.73 | 0.5040 |
| Xueyu Zheng score§ | 7.09(1.79) | 7.06(1.77) | 0.8184 |
| ECG—No. (%)¶ | 1.0000 | ||
| Normal | 2(0.55) | 2(0.55) | |
| Abnormal | 362(99.45) | 364(99.45) | |
| Exercise Tolerance Testing¤ | |||
| Time to onset of ST segment depression(s) | 292.21 ± 279.53 | 242.03 ± 230.97 | 0.1365 |
| Time to onset of angina(s)∮ | 604.50 ± 351.01 | 434.22 ± 322.79 | 0.0560 |
| Maximum ST segment depression(mv) | 0.19 ± 0.16 | 0.22 ± 0.33 | 0.3919 |
*Plus–minus values are means ± SD unless otherwise noted.
†The “concomitant disease” mainly included diabetes mellitus, hypertension or hyperlipidemia.
£Data were missing for one patient in the XXK group and three patients in the CDS group.
‡The mean heart rate in the XXK group was lower than that in the CDS group, P < 0.05.
§“CCS” referred to Canadian Cardiovascular Society. “SAQ” referred to Seattle Angina Questionnaire.
¶“ECG” referred to electrocardiogram and the data were missing for two patients in the XXK group and one patient in the CDS group.
¤Exercise Tolerance Testing (ETT) was administrated in 111 and110 patients in the XXK and CDS groups, respectively.
∮During the exercise testing, 34 and 27 patients experienced an onset of angina in the XXK and CDS groups, respectively.