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Table 1 Baseline demographic and clinical characteristics in overall population

From: Association between smoking and in-hospital mortality in patients with left ventricular dysfunction undergoing coronary artery bypass surgery: a propensity-matched study

Variable

All patients (n = 6531)

Smoking status

P

Non-smokers (n = 2896)

Ex-smokers (n = 2373)

Current smokers (n = 1262)

Age, mean (SD), years

61.4 (9.2)

62.8 (9.3)

60.7 (8.9)

59.6 (9.1)

< 0.001

Female, n (%)

1060 (16.2)

882 (30.5)

117 (4.9)

61 (4.8)

< 0.001

BMI, median (quartile)

24.5 (22.6, 26.7)

24.4 (22.5, 26.5)

24.6 (22.8, 27.0)

24.7 (22.8, 26.9)

0.001

Diabetes mellitus, n (%)

2225 (34.1)

1067 (36.8)

674 (28.4)

484 (38.4)

< 0.001

Hypertension, n (%)

3571 (54.7)

1629 (56.3)

1245 (52.5)

697 (55.2)

0.021

Hyperlipemia, n (%)

2101 (32.2)

684 (23.6)

834 (35.1)

583 (46.2)

< 0.001

Chronic renal failure, n (%)

128 (2.0)

73 (2.5)

37 (1.6)

18 (1.4)

0.014

COPD, n (%)

108 (1.7)

39 (1.3)

51 (2.1)

18 (1.4)

0.059

Peripheral artery disease, n (%)

281 (4.3)

119 (4.1)

129 (5.4)

33 (2.6)

< 0.001

Carotid disease, n (%)

1061 (16.2)

443 (15.3)

428 (18.0)

190 (15.1)

0.012

Cerebrovascular accident, n (%)

576 (8.8)

290 (10.0)

177 (7.5)

109 (8.6)

0.005

Creatinine, median (quartile), umol/dL

82.0 (70.0, 97.0)

80.6 (67.0, 96.0)

83.0 (72.0, 98.0)

84.0 (72.2, 96.9)

0.583

Left main CAD, n (%)

1800 (27.6)

907 (31.3)

569 (24.0)

324 (25.7)

< 0.001

Triple vessel disease, n (%)

4531 (69.4)

2284 (78.9)

1499 (63.2)

748 (59.3)

< 0.001

Previous MI, n (%)

2787 (42.7)

1110 (38.3)

1112 (46.9)

565 (44.6)

< 0.001

PTCA history, n (%)

844 (12.9)

402 (13.9)

295 (12.4)

147 (11.6)

0.096

CCS class

    

< 0.001

NA, n (%)

1274 (19.5)

584 (20.2)

462 (19.5)

228 (18.1)

 

I, n (%)

914 (14.0)

514 (17.7)

267 (11.3)

133 (10.5)

 

II, n (%)

2196 (33.6)

945 (32.6)

851 (35.9)

400 (31.7)

 

III, n (%)

1720 (26.3)

718 (24.8)

621 (26.2)

381 (30.2)

 

IV, n (%)

427 (6.5)

135 (4.7)

172 (7.2)

120 (9.5)

 

LVEF, Mean (SD), %

42.1 (5.3)

42.3 (5.4)

42.1 (5.3)

41.9 (5.4)

0.09

NYHA class

    

< 0.001

I, n (%)

938 (14.4)

387 (13.4)

387 (16.3)

164 (13.0)

 

II, n (%)

2365 (36.2)

1016 (35.1)

893 (37.6)

456 (36.1)

 

III, n (%)

2846 (43.6)

1340 (46.3)

943 (39.7)

563 (44.6)

 

IV, n (%)

382 (5.8)

153 (5.3)

150 (6.3)

79 (6.3)

 

Prior cardiovascular surgery, n (%)

86 (1.3)

34 (1.2)

36 (1.5)

16 (1.3)

0.546

Elective surgery, n (%)

6303 (96.5)

2811 (97.1)

2282 (96.2)

1210 (95.9)

0.083

Preoperative IABP, n (%)

196 (3.0)

88 (3.0)

62 (2.6)

46 (3.6)

0.219

Number of graft, Median (quartile)

4 (3, 4)

4 (4, 5)

4 (3, 4)

4 (3, 4)

< 0.001

Off-pump surgery, n (%)

1224 (18.7)

328 (11.3)

583 (24.6)

313 (24.8)

< 0.001

EuroSCORE

    

< 0.001

0–2, n (%)

1626 (24.9)

500 (17.3)

714 (30.1)

412 (32.6)

 

3–5, n (%)

3323 (50.9)

1525 (52.7)

1200 (50.6)

598 (47.4)

 

6 plus, n (%)

1582 (24.2)

871 (30.1)

459 (19.3)

252 (20.0)

 
  1. BMI body mass index, CAD coronary vascular disease, CCS Canadian Cardiovascular Society, COPD chronic obstructive pulmonary disease, IABP intra-aortic balloon pump, LFEF left ventricular ejection fraction, MI myocardial infarction, NA not available, NYHA New York Heart Association, PTCA percutaneous transluminal coronary angioplasty, SD standard deviation