Table 1. Patient Characteristics.
| Variable | Group A (N=322) (3/29/2004-3/16/2008) | Group B (N=386) (3/17/2008-3/5/2012) | P-Value |
|---|---|---|---|
| Gender | |||
| Male | 279(87) | 338(88) | 0.716 |
| Female | 43(13) | 48(12) | |
| Age | |||
| Mean | 61 | 61 | 0.385 |
| Median(range) | 62(25-83) | 62(23-84) | |
| COPD | 21(7) | 24(6) | 0.121 |
| CAD | 49(15) | 70(18) | 0.301 |
| Diabetes | 50(16) | 61(16) | 0.920 |
| Any tobacco history | 231(72) | 278(72) | 0.934 |
| Cigarette pack years* | |||
| Median(range) | 30(0.03-137.5) | 29.4(0.2-180) | 0.426 |
| Mean | 34.4 | 32.9 | |
| Smoking cessation time before surgery† | |||
| 0-14 days | 16(5) | 24(6) | 0.258 |
| >14 days;<=1 | 10(3) | 10(3) | |
| >1 mo;<=12 | 33(10) | 60(16) | |
| >12 mo; <=5 y | 21(7) | 23(6) | |
| >5 y | 149(47) | 151(40) | |
| Never smoked | 91(28) | 108(29) | |
| ASA risk score | |||
| 1 | 0(0) | 1(0) | 0.029‡ |
| 2 | 68(21) | 53(14) | |
| 3 | 252(78) | 329(85) | |
| 4 | 2(1) | 3(1) | |
Note: Data are no. of patients (%) unless otherwise indicated.
*
Data missing for 100 patients in Group A and for 130 patients in Group B.
†
Data missing for 2 patients in Group A and for 10 patients in Group B.
‡
Statistically significant.
COPD indicates chronic obstructive pulmonary disease; CAD, coronary arterial disease; ASA, American Society of Anesthesiologist.