Table 1.
Characteristics of the study participants. Counts and continuous variables are reported as median (5-95 percentile).
| CIS | SCC | |||
|---|---|---|---|---|
|
|
||||
| Cases | Controls | Cases | Controls | |
| Women | 621 | 621 | 457 | 457 |
| Age at diagnosis (in years)a | 33 (23-51) | 33 (23-51) | 41 (28-67) | 41 (28-67) |
| Age at entry (in years) | 25 (18-45) | 26 (18-45) | 33 (20-59) | 33 (20-59) |
| Time in study (in years) | 6.1 (0.4-15.4) | 6.2 (0.8-15.6) | 7.7 (0.3-17.8) | 8.0 (1.2-18.8) |
|
|
||||
| Total number of smears | 1740 | 1489 | 1265 | 1177 |
| No. of smears/subject | 2 (1 - 13) | 2 (1 - 14) | 2 (1 - 18) | 2 (1 - 15) |
| No. of smears [0,1] yrs before diagnosis |
520 | 167 | 256 | 109 |
| (1,5] yrs | 559 | 589 | 342 | 377 |
| (5,10] yrs | 444 | 494 | 382 | 403 |
| (10,15] yrs | 171 | 182 | 201 | 196 |
| (15,19] yrs | 27 | 30 | 53 | 50 |
|
|
||||
| HPV-positive smears (%) | 65 | 15 | 55 | 12 |
| HPV16-positive smears (%) | 34 | 4 | 33 | 3 |
a
For controls, age at time of diagnosis of the matched case woman.