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. 2012 Nov 1;143(4):1036–1043. doi: 10.1378/chest.12-1205

Table 1.

—Patient Characteristics

Characteristic 21 Gauge (n = 240) 22 Gauge (n = 995) Total (N = 1,235) P Valuea
Age, y 63 ± 15 63 ± 13 63 ± 13 .85
Female sex 113 (47) 478 (48) 591 (48) .79
White race 185 (77) 816 (82) 1,001 (81) .08
Current/prior smoker 174 (73) 736 (74) 910 (74) .64
Presence of at least one comorbid conditionb 107 (45) 459 (46) 566 (46) .67
Lymph nodes sampled per patient 2.1 ± 0.9 2.3 ± 1.2 2.2 ± 1.2 .01

Data are presented as mean ± SD or No. (%).

a

Calculated using χ tests for categorical variables and Student t tests for continuous variables.

b

Comorbities include COPD, congestive heart failure, history of stroke, coronary artery disease, diabetes mellitus, renal failure while on or off dialysis, and hematologic malignancy.