Table 2. Stages and histology of primary lung cancer diagnosed in the study period.
| Stage & histology | 1987–2012, n (%) | 1987–1999, n (%) | 2000–2012, n (%) | Comparison of two periods† |
|---|---|---|---|---|
| Stages at diagnosis | X2 =20.7; df =8; P=0.008‡ | |||
| Stage IA | 27 (4.5) | 0 (0.0) | 27 (5.6) | |
| Stage IB | 28 (4.7) | 2 (1.7) | 26 (5.4) | |
| Stage IIA | 6 (1.0) | 1 (0.9) | 5 (1.0) | |
| Stage IIB | 26 (4.3) | 6 (5.2) | 20 (4.1) | |
| Stage IIIA | 33 (5.5) | 4 (3.4) | 29 (6.0) | |
| Stage IIIB | 167 (27.9) | 39 (33.6) | 128 (26.6) | |
| Stage IV | 254 (42.5) | 45 (38.8) | 209 (43.4) | |
| Limited | 17 (2.8) | 7 (6.0) | 10 (2.1) | |
| Extensive | 40 (6.7) | 12 (10.3) | 28 (5.8) | |
| Total | 598 (100.0) | 116 (100.0) | 482 (100.0) | |
| Lung cancer histology | P=0.012§ | |||
| NSCLC | 538 (89.4) | 101 (83.5) | 437 (90.9) | |
| SCLC | 57 (9.5) | 19 (15.7) | 38 (7.9) | |
| Mesothelioma and other carcinoids | 7 (1.1) | 1 (0.8) | 6 (1.2) | |
| Total | 602 (100.0) | 121 (100.0) | 481 (100.0) |
†, “two periods” refers to 1987–1999 vs. 2000–2012; ‡, Chi-square test; §, Fisher’s exact test. NSCLC, non-small cell lung cancer; SCLC, small cell lung cancer.