Table 1.

Occurrence of multiple HPV types in individual visits as well as cumulatively during the first year and the first 4 years of follow-up in the Ludwig-McGill cohort

No. HPV typesNo. (%) observed by visit number and scheduled follow-up time*
Cumulative
1 (enrolment)2 (4 mo)3 (8 mo)4 (1 y)5 (1.5 y)6 (2 y)7 (2.5 y)8 (3 y)9 (3.5 y)10 (4 y)First yearFirst 4 y
01,704 (83.1)1,639 (83.0)1,568 (83.1)1,552 (84.3)510 (83.2)1,495 (85.7)916 (86.7)1,383 (87.1)1,282 (86.3)956 (88.4)1,240 (66.3)822 (51.8)
1282 (13.8)282 (14.3)267 (14.2)250 (13.6)86 (14.0)215 (12.3)121 (11.5)172 (10.8)160 (10.8)104 (9.6)402 (21.5)411 (25.9)
252 (2.5)47 (2.4)39 (2.1)32 (1.7)10 (1.6)32 (1.8)15 (1.4)23 (1.5)31 (2.1)16 (1.5)158 (8.4)167 (10.5)
38 (0.4)7 (0.4)10 (0.5)8 (0.4)5 (0.8)2 (0.1)3 (0.3)9 (0.6)9 (0.6)3 (0.3)50 (2.7)96 (6.1)
43 (0.2)1 (0.1)1 (0.1)2 (0.3)1 (0.1)2 (0.2)1 (0.1)3 (0.2)2 (0.2)11 (0.6)47 (3.0)
51 (0.1)1 (0.1)1 (0.1)1 (0.1)9 (0.5)26 (1.6)
61 (0.1)12 (0.8)
76 (0.4)
81 (0.1)
Total*2,0501,9761,8861,8426131,7451,0571,5881,4861,0821,8711,588§
  • * Excluded women with missing HPV test results or β-globin-negative specimens and those with a missing cytologic report.

  • Visits 5 and 7 were introduced into the study after many women had the opportunity to complete them.

  • Based on women with at least 3 evaluable visits of 4 possible ones.

  • § Based on women with at least 7 evaluable visits of 10 possible ones.