Table 3. Treatment strategy, baseline coronary angiographic findings, and procedural characteristics in patients who underwent CAG.

	Young age group (n=5281)	Old age group (n=4896)	p
Primary PCI	4321 (81.8)	3977 (81.2)	0.442
Facilitated PCI	153 (2.9)	123 (2.5)	0.232
Thrombolysis	397 (7.5)	241 (4.9)	<0.001
Conservative treatment	382 (7.2)	518 (10.6)	<0.001
Door-to-balloon time (min)	106.4±54.3	106.6±52.4	0.847
Number of involved vessels (%)
1	2771 (52.8)	1969 (41.4)	<0.001
2	1496 (28.5)	1495 (31.5)	0.001
3	904 (17.2)	1146 (24.1)	<0.001
LM complex	69 (1.3)	130 (2.7)	<0.001
LM isolated	7 (0.1)	12 (0.3)	0.172
Target lesion location (%)
LAD	2874 (54.9)	2387 (50.4)	<0.001
LCX	509 (9.7)	435 (9.2)	0.356
RCA	1803 (34.5)	1837 (38.8)	<0.001
LM	46 (0.9)	76 (1.6)	0.001
ACC/AHA types (%)
Type A	206 (4.3)	169 (3.9)	0.341
Type B1	986 (20.6)	722 (16.7)	<0.001
Type B2	1370 (28.6)	1247 (28.8)	0.826
Type C	2222 (46.4)	2185 (50.5)	<0.001
Pre-procedure TIMI flow 0	2807 (56.2)	2510 (55.1)	0.309
Post-procedure TIMI flow 3	4612 (93.9)	4047 (90.8)	<0.001
Stent type (%)
Bare metal stent	381 (7.9)	430 (10.0)	<0.001
Paclitaxel-eluting stent	1139 (23.6)	1041 (24.1)	0.536
Sirolimus-eluting stent	1556 (32.2)	1262 (29.2)	0.002
Zotarolimus-eluting stent	818 (16.9)	760 (17.6)	0.388
Everolimus-eluting stent	542 (11.2)	456 (10.6)	0.320
Other DES	424 (8.8)	389 (9.0)	0.687
Stent length (mm)	24.4±6.6	24.7±6.6	0.018
Stent diameter (mm)	3.5±0.6	3.3±0.6	<0.001
Total stents per patient (n)	1.4±0.7	1.5±0.8	0.002
Multi-vessel PCI	761 (15.2)	733 (16.3)	0.154
PCI success rate (%)	5044 (99.0)	4541 (99.0)	0.922

Data are expressed as number (%) or mean±standard deviation. CAG: coronary angiogram, PCI: percutaneous coronary intervention, LM: left main, LAD: left anterior descending artery, LCX: left circumflex artery, RCA: right coronary artery, ACC/AHA: American College of Cardiology/American Heart Association, TIMI: thrombolysis In myocardial infarction, DES: drug-eluting stent