Table 1.

Characteristics of the participants

Cancer in situInvasive squamous cell carcinoma
CasesControlsCasesControls
Number of study subjects515515315315
Age at diagnosis, y*33 (18-64)33 (18-63)40 (24-81)40 (24-81)
Age at entry, y26 (15-60)26 (15-60)32 (15-78)32 (15-75)
Study time, y
    Time from first smear to diagnosis5.3 (0.03-17.5)5.4 (0.01-17.3)7.2 (0.01-17.8)7.6 (0.06-17.8)
    Time from last smear to diagnosis0.6 (0.01-16.2)2.4 (0.01-16.2)1.8 (0.01-15.9)2.8 (0.01-14.7)
Median no. of smears per subject (range)2 (1-13)2 (1-11)2 (1-15)2 (1-11)
  • *For controls age at time of diagnosis of their respective case.