Table 1 Baseline characteristics of study patients based on RC quartiles

Clinical characteristics

   Age, years

65.00 ± 7.23

64.15 ± 7.20

64.76 ± 7.18

65.41 ± 7.19

65.68 ± 7.18

   BMI, kg/m²

25.29 ± 3.15

25.31 ± 3.18

25.30 ± 3.20

25.06 ± 3.03

25.51 ± 3.16

   SBP, mmHg

130.50 [120.00, 143.00]

130.00 [120.00, 141.00]

130.00 [121.00, 141.00]

130.00 [120.50, 142.00]

133.00 [121.00, 146.00]

   DBP, mmHg

75.00 [68.00, 81.00]

74.00 [67.00, 80.00]

74.50 [68.00, 80.00]

75.00 [68.00, 81.00]

76.00 [70.00, 83.00]

Diagnosis on admission

   UAP

1324 (88.0)

335 (88.9)

333 (88.6)

330 (87.8)

326 (86.7)

   NSTEMI

92 (6.1)

22 (5.8)

22 (5.9)

25 (6.6)

23 (6.1)

   STEMI

89 (5.9)

20 (5.3)

21 (5.6)

21 (5.6)

27 (7.2)

Medical history

   Previous MI

121 (8.0)

29 (7.7)

30 (8.0)

31 (8.2)

31 (8.2)

   Previous PCI

330 (22.0)

86 (22.8)

87 (23.2)

81 (21.6)

76 (20.3)

   Family CVD

109 (7.2)

32 (8.5)

25 (6.6)

23 (6.1)

29 (7.7)

   Hypertension

1058 (70.3)

253 (67.1)

260 (69.1)

270 (71.8)

275 (73.1)

   Hyperlipemia

1054 (70.0)

256 (67.9)

259 (68.9)

259 (68.9)

280 (74.5)

   T2DM

716 (47.6)

181 (48.0)

181 (48.1)

167 (44.4)

187 (49.7)

   Current smoking

50 (3.3)

16 (4.2)

9 (2.4)

12 (3.2)

13 (3.5)

Diseased vessels

   LM disease

84 (5.6)

16 (4.2)

22 (5.9)

26 (6.9)

20 (5.3)

   Three-vessel disease

465 (30.9)

115 (30.5)

110 (29.3)

128 (34.0)

112 (29.8)

   CTO disease

257 (17.1)

59 (15.6)

67 (17.9)

60 (16.0)

71 (18.9)

   ISR disease

110 (7.3)

31 (8.2)

23 (6.1)

26 (6.9)

30 (8.0)

   SYNTAX score

11.00 [7.00, 16.00]

11.00 [8.00, 16.00]

11.00 [7.25, 16.25]

11.00 [7.00, 16.00]

11.00 [7.00, 16.00]

   Number of stents

1.00 [1.00, 2.00]

1.00 [1.00, 2.00]

1.00 [1.00, 2.00]

1.00 [1.00, 2.00]

1.00 [1.00, 2.00]

   Diameter of stents, mm

2.75 [2.50, 3.00]

2.75 [2.50, 3.00]

2.75 [2.50, 3.00]

2.75 [2.50, 3.00]

2.75 [2.50, 3.00]

   Length of stents, mm

23.00 [16.00, 30.00]

23.00 [16.00, 30.00]

23.00 [15.00, 30.00]

23.00 [15.25, 30.00]

23.00 [15.75, 30.00]

Laboratory findings

   LVEF, %

65.00 [60.00, 68.00]

65.00 [60.00, 68.00]

65.00 [61.00, 68.00]

65.00 [60.00, 68.00]

65.00 [60.00, 67.00]

   eGFR, mL/min/1.73 m²

92.17 [83.83, 98.32]

94.31 [86.69, 100.70]

92.84 [85.25, 98.84]

91.77 [82.16, 97.84]

89.43 [80.06, 96.49]

   Cr, µmol/L

57.40 [50.90, 65.40]

55.70 [50.27, 62.82]

55.80 [50.20, 63.10]

58.80 [51.70, 67.00]

59.70 [52.15, 68.20]

   TG, mmol/L

1.41 [1.05, 1.90]

0.97 [0.77, 1.17]

1.20 [1.04, 1.46]

1.58 [1.31, 1.85]

2.30 [1.89, 2.80]

   TC, mmol/L

4.21 [3.62, 4.92]

3.81 [3.31, 4.42]

4.06 [3.54, 4.64]

4.34 [3.74, 5.01]

4.69 [4.05, 5.44]

   HDL-C, mmol/L

1.16 [1.01, 1.35]

1.23 [1.08, 1.43]

1.19 [1.03, 1.36]

1.16 [1.01, 1.33]

1.08 [0.95, 1.27]

   LDL-C, mmol/L

2.43 [1.92, 3.08]

2.23 [1.76, 2.79]

2.38 [1.89, 2.94]

2.52 [2.01, 3.19]

2.69 [2.06, 3.32]

   RC, mmol/L

0.54 [0.42, 0.69]

0.35 [0.29, 0.39]

0.48 [0.45, 0.51]

0.61 [0.57, 0.65]

0.84 [0.75, 0.98]

   HbA1c, %

6.30 [5.80, 7.40]

6.20 [5.70, 7.20]

6.20 [5.80, 7.30]

6.30 [5.80, 7.30]

6.40 [5.90, 7.60]

   FBG, mmol/L

5.91 [5.19, 7.68]

5.85 [5.16, 7.50]

5.88 [5.18, 7.46]

5.88 [5.20, 7.62]

6.05 [5.28, 8.26]

Medications, n (%)

   DAPT

1504 (99.9)

377 (100.0)

375 (99.7)

376 (100.0)

376 (100.0)

   Statin

1491 (99.1)

375 (99.5)

371 (98.7)

372 (98.9)

373 (99.2)

   β-Blocker

971 (64.5)

228 (60.5)

245 (65.2)

244 (64.9)

254 (67.6)

   ACEI/ARB

712 (47.3)

169 (44.8)

166 (44.1)

189 (50.3)

188 (50.0)

   CCB

573 (38.1)

138 (36.6)

132 (35.1)

155 (41.2)

148 (39.4)

   Antidiabetic drugs

      Insulin

174 (11.6)

35 (9.3)

38 (10.1)

49 (13.0)

52 (13.8)

      OAD

409 (27.2)

95 (25.2)

106 (28.2)

101 (26.9)

107 (28.5)