Table 1

 Characteristics of study population

N (%)
Male1033 (92)
Pathological stage
    IA250 (22)
    IB871 (78)
Histological types
    Squamous664 (59)
    Adenocarcinoma290 (26)
    Large-cell carcinoma73 (7)
    Bronchioloalveolar48 (4)
    Non-specified46 (4)
Involvement (pathological)
    Visceral pleura286 (26)
    Pneumonitis-atelectasis < entire lung273 (24)
    Main bronchus >2 cm from carina72 (6)