Characteristics of the 976 Patients Undergoing Resection by Preoperative PET Use
| Characteristic | No preoperative PET | Preoperative PET | P |
| Number of subjects | 427 (43.8%) | 549 (56.3%) | |
| Year of surgery | |||
| 1997–2000 | 66.7 | 5.3 | <0.001 |
| 2001–2004 | 20.8 | 36.8 | |
| 2005–2007 | 9.6 | 35.3 | |
| 2008–2009 | 2.8 | 22.6 | |
| Age (y) | |||
| <65 | 34.7 | 41.4 | 0.082 |
| 65–74 | 40.1 | 37.5 | |
| ≥75 | 25.3 | 21.1 | |
| Currently married | 44.3 | 47.4 | 0.336 |
| Race | |||
| White | 90.6 | 89.6 | 0.389 |
| Black | 4.2 | 4.4 | |
| Other | 0.5 | 1.6 | |
| Unknown | 4.7 | 4.4 | |
| Preexisting comorbidity (Charlson)* | |||
| No conditions | 24.8 | 30.1 | 0.274 |
| 1 condition | 40.3 | 37.5 | |
| 2–3 conditions | 27.2 | 24.0 | |
| ≥4 conditions | 7.8 | 8.4 | |
| Existing chronic obstructive pulmonary disease† | 57.4 | 53.6 | 0.233 |
| Existing congestive heart failure‡ | 7.3 | 8.6 | 0.457 |
| Existing liver or kidney disease§ | 3.3 | 3.6 | 0.758 |
↵* Preexisting comorbidity refers to Charlson comorbidity index.
↵† International Classification of Diseases, Ninth Revision (ICD-9), 490–496, 500–505, and 506.4.
↵‡ ICD-9 428.
↵§ Liver diseases: ICD-9 571.2, 571.4, 571.5, 571.6, 572.2–572.8, and 456–456.21; kidney diseases: ICD-9 582, 583, 585, 586, and 588.
Data are percentages.