Table 3 Mean age and smoking status by histological type and filter/nonfilter cigarette consumption among male current smokers
From: Filter cigarette smoking and lung cancer risk; a hospital-based case–control study in Japan
Cases | |||||
|---|---|---|---|---|---|
Type of smoking | Squamous cell carcinoma | Adenocarcinoma | All lung cancers | Controls | |
Number (%) | Mixed | 114 (83.2) | 84 (61.3) | 259 (72.8) | 80 (49.4) |
Filter | 23 (16.8) | 53 (38.7) | 97 (27.2) | 82 (50.6) | |
Mean age | Mixed | 67.2 | 65.5 | 66.6 | 63.6 |
Filter | 56.3 | 52.3 | 53.2 | 51.6 | |
Mean number of cigarettes per day | Mixed | 28.3 | 26.4 | 27.3 | 23.9 |
Filter | 34.5 | 32.1 | 32.6 | 28.6 | |
Mean total duration | Mixed | 47.0 | 45.3 | 46.5 | 43.7 |
Filter | 34.1 | 30.4 | 32.0 | 28.5 | |
Mean duration of filtered cigarettes | Mixed | 29.4 | 29.2 | 29.5 | 26.6 |
Filter | 34.1 | 30.4 | 32.0 | 28.5 | |
Mean duration of nonfiltered cigarettes | Mixed | 17.6 | 16.1 | 17.0 | 17.2 |
Filter | — | — | — | — | |
