Table 3.
Association between smoking and in-hospital mortality according to baseline characteristics
| Baseline characteristics | Current smoker | Ex-smoker | Non-smoker | Pinteraction value |
| Age≥55 years | 0.78 (0.69 to 0.89) | 0.90 (0.77 to 1.05) | Reference | 0.0986 |
| Age<55 years | 0.72 (0.53 to 0.99) | 0.85 (0.48 to 1.49) | Reference | |
| Male | 0.78 (0.68 to 0.89) | 0.94 (0.80 to 1.10) | Reference | 0.0163 |
| Female | 0.75 (0.58 to 0.98) | 0.45 (0.26 to 0.77) | Reference | |
| BMI≥24 kg/m2 | 0.80 (0.67 to 0.94) | 0.89 (0.71 to 1.12) | Reference | 0.2063 |
| BMI<24 kg/m2 | 0.74 (0.63 to 0.88) | 0.89 (0.73 to 1.10) | Reference | |
| LVEF≥50% | 0.77 (0.67 to 0.88) | 0.98 (0.82 to 1.16) | Reference | 0.0149 |
| LVEF<50% | 0.87 (0.68 to 1.11) | 0.74 (0.54 to 1.01) | Reference | |
| Hypertension—Yes | 0.85 (0.72 to 1.00) | 0.96 (0.78 to 1.17) | Reference | 0.4556 |
| Hypertension—No | 0.70 (0.59 to 0.83) | 0.80 (0.64 to 1.01) | Reference | |
| Previous angina—Yes | 0.84 (0.65 to 1.07) | 0.83 (0.62 to 1.12) | Reference | 0.1833 |
| Previous angina—No | 0.76 (0.66 to 0.87) | 0.92 (0.78 to 1.10) | Reference | |
| Previous MI—Yes | 0.67 (0.47 to 0.97) | 0.67 (0.45 to 1.00) | Reference | 0.0557 |
| Previous MI—No | 0.77 (0.68 to 0.87) | 0.91 (0.78 to 1.07) | Reference | |
| Previous PCI—Yes | 0.95 (0.44 to 2.04) | 1.23 (0.56 to 2.72) | Reference | 0.7975 |
| Previous PCI—No | 0.78 (0.69 to 0.88) | 0.89 (0.76 to 1.04) | Reference | |
| Previous HF—Yes | 0.96 (0.57 to 1.60) | 0.85 (0.53 to 1.37) | Reference | 0.0086 |
| Previous HF—No | 0.77 (0.68 to 0.87) | 0.88 (0.76 to 1.03) | Reference | |
| Diabetes—Yes | 0.78 (0.60 to 1.02) | 0.86 (0.63 to 1.18) | Reference | 0.4065 |
| Diabetes—No | 0.77 (0.67 to 0.88) | 0.90 (0.76 to 1.07) | Reference | |
| Hyperlipidaemia—Yes | 0.75 (0.45 to 1.24) | 1.16 (0.66 to 2.03) | Reference | 0.1239 |
| Hyperlipidaemia—No | 0.77 (0.68 to 0.87) | 0.87 (0.74 to 1.02) | Reference | |
| Diagnosis of STEMI | 0.81 (0.71 to 0.93) | 0.93 (0.78 to 1.11) | Reference | 0.9700 |
| Diagnosis of NSTEMI | 0.61 (0.48 to 0.78) | 0.71 (0.54 to 0.92) | Reference |
Adjusted for age, gender, BMI, systolic blood pressure, heart rate, admission diagnosis, cardiac arrest, chest pain, ST elevation, anterior wall MI, Killip classification, risk factor (medical history of diabetes, hypertension, hyperlipidaemia, premature family CAD history, heart failure, renal failure and COPD), medical history (previous angina, PCI and CABG), creatinine level, haemoglobin level, GRACE risk score and primary PCI.
BMI, body mass index;CABG, coronary artery bypass grafting; CAD, coronary artery disease; COPD, chronic obstructive pulmonary disease; GRACE, Global Registry of Acute Coronary Events; HF, heart failure; LVEF, left ventricular ejection fraction; MI, myocardial infarction;NSTEMI, non-ST-elevation MI; PCI, percutaneous coronary intervention; STEMI, ST-elevation MI.