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Table 2 Comparison of CCS, SAQ, 6MWT, nitroglycerin dosage, and NYHA classification

From: A modified regimen of extracorporeal cardiac shock wave therapy for treatment of coronary artery disease

  Control group (14) Group A ( n = 20) Group B ( n = 21) P
6MWT, meters     
0 month 363.86 ± 150.92 344.25 ± 106.44 329.43 ± 134.71 0.617
3 month 322.07 ± 150.07 422.20 ± 77.30§ 385.43 ± 78.62§ 0.073
6 month 325.93 ± 157.32 434.25 ± 99.70§ 405.33 ± 104.36§ 0.296
12 month 348.43 ± 132.06 477.95 ± 105.34 452.00 ± 117.47a 0.020*
CCS grading of angina     
0 month 2 (2.0, 3.0) 2 (1, 2) 3 (2, 3)b 0.045*
3 month 2 (2.0, 2.3) 1 (1, 1) 2 (1, 2)§ <0.001*
6 month 2 (1.0, 2.3)§ 1 (1, 1) 2 (1, 2)§ 0.016*
12 month 2 (1.0, 3.0) 1 (1, 1) 1 (1, 2) <0.001*
NYHA classification     
0 month 2 (1, 3) 1.5 (1, 3) 2 (1, 2.5) 0.822
3 month 1 (1, 3) 1 (1, 2)§ 1 (1, 1)§ 0.138
6 month 1 (1, 2.3) 1 (1, 1)§ 1 (1, 1)§ 0.081
12 month 1 (1, 2.3) 1 (1, 1)§ 1 (1, 1) 0.018*
SAQ score     
0 month 63.21 ± 11.89 64.90 ± 11.72 67.71 ± 13.05 0.549
3 month 63.86 ± 13.27 69.50 ± 10.28 76.38 ± 13.20 0.015*
6 month 60.14 ± 12.82 75.00 ± 10.45 76.14 ± 12.28 <0.001*
12 month 59.21 ± 15.66 79.63 ± 9.87 82.70 ± 10.16 <0.001*
Nitroglycerin (times/week)     
0 month 1 (0, 4) 1 (0, 2) 2 (0, 3) 0.589
3 month 1 (0, 4) 0 (0, 1) 0 (0, 2) 0.151
6 month 0 (0, 2) 0 (0, 1) 0 (0, 1) 0.597
12 month# 1 (0, 3) 0 (0, 0)a 0 (0, 0)a 0.023*
  1. Data were presented as mean ± standard deviation, number (%), or median (IRQ) as described in the statistical analysis methods.
  2. #One patient in group A and 11 patients in group B had missing data of nitroglycerin dosage at month 12.
  3. *P < 0.05, indicates significant difference among control group, group A, and group B.
  4. a,b P < 0.0167 (0.05/3), indicates significant difference was identified when compared with acontrol group and bgroup A.
  5. § P < 0.05, indicates significant difference was identified when compared with month 0 of the corresponding group.