Efficacy and prognostic impact of Pericarpium Trichosanthis injection combined with nicorandil for intractable angina pectoris in elderly patients: A retrospective study

Table 3 Comparison of cardiac function before and after treatment between both groups (mean ± SD)

Group	CCS angina grade (score)		SAQ grade (score)		6WMT (m)
	Control group	Study group	Control group	Study group	Control group	Study group
Pretherapy	1.6 ± 0.5	1.0 ± 0.5	66.4 ± 12.5	60.9 ± 16.0	352.4 ± 100.2	414.2 ± 84.1
Post-treatment	1.3 ± 0.7	1.8 ± 0.5	68.3 ± 10.7	63.3 ± 16.3	385.0 ± 110.1	371.2 ± 85.2
t	2.8	13.2	28.5	33.6	28.7	225.1
P value	0.76	0.02a	0.36	0.53	0.85	0.01a

^aP < 0.05, statistically significant.

CCS: Canadian Cardiovascular Society; SAQ: Self-acceptance questionnaire; 6MWT: 6-min walking test.