Document Classification

Section Type: RESULTS

Text: Independent predictors of positive nodes included adenocarcinoma or large cell histology (OR 2. 6, 95 % confidence interval [CI] = 1. 8-3. 9), apparent metastatic disease on chest radiography (OR 2. 4, 95 % CI = 1. 2-4. 7), central location of the primary tumor (OR 2. 1, 95 % CI = 1. 4-3. 3), symptoms from the primary tumor (OR 1. 6, 95 % CI = 1. 1-2. 4), tumor diameter > or = 3. 6 cm (OR 1. 5, 95 % CI = 1. 0-2. 3), and age less than 65 years (OR 1. 5, 95 % CI = 1. 0-2. 2).