Table 5.

Subgroup analysis of quantitative coronary angiography comparing optimal angioplasty with stent implantation versus direct stenting

	Conventional angioplasty (+ stent) (n=47)	Direct stenting (n=89)	p Value
Balloon size (mm)	3.32 (0.31)	3.39 (0.27)	0.35
Balloon:artery ratio	1.00 (0.09)	1.05 (0.09)	0.068
Maximal balloon pressure (atm)	13.7 (1.2)	13.3 (1.6)	0.23
Number of stents	1.0 (0.0)	1.0 (0.0)	1
Length of stents (mm)	17.8 (3.6)	15.9 (1.7)	0.012
Reference diameter (mm)
Before	3.30 (0.45)	3.22 (0.37)	0.46
After	3.28 (0.44)	3.17 (0.33)	0.29
At follow up	3.19 (0.44)	3.16 (0.40)	0.77
Minimal luminal diameter (mm)
Before	0.47 (0.23)	0.62 (0.35)	0.035
After	3.14 (0.61)	3.11 (0.54)	0.86
At follow up	1.93 (0.98)	2.56 (0.86)	0.031
Stenosis (%)
Before	85.3 (7.8)	80.5 (10.0)	0.022
After	5.9 (8.4)	4.8 (9.4)	0.74
At follow up	39.5 (30.5)	21.9 (22.8)	0.037
Gain (mm)	2.64 (0.64)	2.48 (0.64)	0.31
Loss (mm)	1.22 (0.90)	0.62 (0.69)	0.018
Net gain (mm)	1.53 (0.93)	1.99 (0.92)	0.15
Diameter stenosis >50% at follow up	13 (28.6%)	14 (15.7%)	0.011

Data are mean (SD).