Table 3. Survival rates and duration of primary lung cancer diagnosed in the study period.
| Year of diagnosis | 1987–2012 (n=621) | 1987–1999 (n=137) | 2000–2012 (n=484) | Comparison of two periods† |
|---|---|---|---|---|
| Survival rates‡ (%) | X2 =10.99; df =1; P=0.001 | |||
| 6-month | 50.2 | 42.7 | 52.3 | |
| 1-year | 32.1 | 24.5 | 34.1 | |
| 3-year | 14.5 | 7.0 | 16.4 | |
| 5-year | 8.8 | 4.0 | 10.1 | |
| Median survival time in months | 6.1 | 4.4 | 6.7 | |
| (95% CI) | (5.0, 7.1) | (2.8, 5.9) | (5.5, 7.8) | |
| No. of events | 516 | 119 | 397 | |
| No. of censored | 105 (16.9%) | 18 (13.1%) | 87 (18.0%) |
†, comparison of survival between two periods (1987–1999 vs. 2000–2012) using log-rank test; ‡, using Kaplan-Meier method.