Case Control Study
Copyright ©The Author(s) 2022.
World J Clin Cases. Jan 7, 2022; 10(1): 35-42
Published online Jan 7, 2022. doi: 10.12998/wjcc.v10.i1.35
Table 3 Comparison of blood flow classification, n (%)
Timing
Group
Number of cases
Grade 0
Grade I
Grade II
Grade III
Before treatmentStudy group4725 (53.19)12 (25.53)7 (14.89)3 (6.38)
Control group4723 (48.94)15 (31.91)5 (10.64)4 (8.51)
χ2 value0.1700.4680.3820.000
P value0.6800.4940.5361.000
After treatmentStudy group4736 (76.60)5 (10.64)5 (10.64)1 (2.13)
Control group4727 (57.45)15 (31.91)3 (6.38)2 (4.26)
χ2 value3.8996.3510.5450.000
P value0.0480.0120.4601.000