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Table 3 Comparisons between SCS and PMR in mean exercise tolerance and CCS at 24 months

From: Clinical and cost-effectiveness analysis of an open label, single-centre, randomised trial of spinal cord stimulation (SCS) versus percutaneous myocardial laser revascularisation (PMR) in patients with refractory angina pectoris: The SPiRiT trial

 

SCS

PMR

Difference adjusted

for baseline 95%CI

p

Exercise test at 24 months

(n = 22)

(n = 21)

  

   Mean (SEM) exercise time

7.04 (0.76)

7.70 (0.88)

0.05 (-2.08, 2.18)

0.96

   Mean* (SEM) time to angina

7.69 (1.08)

7.57 (1.08)

0.91 (-2.67, 4.49)

0.62

   No angina during exercise

11 (50%)

7 (33%)

  

CCS class at 24 months

(n = 22)

(n = 21)

  

   1

3 (14%)

2 (9%)

 

0.55**

   2

9 (41%)

9 (43%)

  

   3

8 (36%)

6 (29%)

  

   4

2 (9%)

4 (9%)

  

Change in CCS >= 2 classes

    

   No

15 (68%)

17 (81%)

 

0.49**

   Yes

7 (32%)

4 (19%)

  
  1. * Calculated from area under Kaplan-Meier time to angina curves (some patients stopped exercising before onset of angina). Comparisons based on change from baseline and within patient correlation estimated from uncensored patients from both groups combined (ρ = 0.28).
  2. **p-values unadjusted for baseline