Sputum results in the screened group in each year
| Baseline | Year 2 | Year 3 | Year 4 | Year 5 | |
| Cytology or cytometry result# | 785¶ | 639¶ | 560¶ | 516¶ | 447¶ |
| Normal | 542 (81) | 398 (87) | 343 (94) | 300 (89) | 221 (92) |
| Abnormal | |||||
| Low grade | 111 (17) | 51 (11) | 18 (5) | 33 (10) | 17 (7) |
| High grade | 16 (2) | 6 (1) | 2 (1) | 4 (1) | 3 (1) |
| Died or cancer diagnosed since last visit | 19 | 22 | 24 | 32 | |
| No sputum result | 116 (15)+ | 184 (29)+ | 197 (35)+ | 179 (35)+ | 206 (46)+ |
| Did not provide sample | 68 | 131 | 155 | 157 | 195 |
| Tried but unable to provide sample | 12 | 10 | 3 | 8 | 5 |
| Provided spontaneous sample§ | 33 | 43 | 38 | 14 | 6 |
| Provided induced sample§ | 3 | 0 | 1 | 0 | 0 |
| Cytology result (where available) | 604 | 400 | 301 | 285 | 198 |
| Normal | 503 (83) | 358 (90) | 289 (96) | 269 (94) | 191 (96) |
| Abnormal | |||||
| Low grade | 86 (14) | 36 (9) | 11 (4) | 13 (5) | 5 (3) |
| High grade | 15 (2) | 6 (2) | 1 (<1) | 3 (1) | 2 (1) |
| Cytometry result (where available) | 603 | 418 | 350 | 323 | 237 |
| Normal | 570 (95) | 400 (96) | 342 (98) | 298 (92) | 221 (93) |
| Abnormal | |||||
| Low grade | 32 (5) | 18 (4) | 7 (2) | 22 (7) | 15 (6) |
| High grade | 1 (<1) | 0 | 1 (<1) | 3 (1) | 1 (<1) |
Data are presented as n or n (%); the percentages in brackets for normal or abnormal sputum are based on the total number who had a sputum result as the denominators. #: in some cases only cytology or cytometry results were available (not both) and so the result classification was based on the known result if a repeat sputum sample was not done; ¶: total number of individuals expected to provide sputum samples in each year (i.e. excluding those who had an abnormal sputum result, died or were diagnosed with cancer who were no longer expected to provide sputum samples); +: the percentage who did not provide a sputum sample, out of the total expected; §: sample was inadequate for cytology and cytometry assessment.