Table 1

 Descriptive characteristics of adolescent girls aged 10-17 years included in cohort, Denmark and Sweden, October 2006-December 2010. Values are numbers (percentages) unless stated otherwise

CharacteristicsOverall (n=997 585)Denmark (n=387 294)Sweden (n=610 291)
Person years of follow-up2 797 7011 090 5151 707 186
Mean (SD) age at study entry (years)12.8 (2.7)12.5 (2.6)12.9 (2.7)
Year of study entry:
 2006700 156 (70.2)260 849 (67.4)439 307 (72.0)
 200774 809 (7.5)32 044 (8.3)42 765 (7.0)
 200873 653 (7.4)31 307 (8.1)42 346 (6.9)
 200973 909 (7.4)31 439 (8.1)42 470 (7.0)
 201075 058 (7.5)31 655 (8.2)43 403 (7.1)
Exposed to quadrivalent human papillomavirus vaccine
Mean (SD) age at vaccination (years)14.6 (1.7)14.0 (1.6)15.7 (1.4)
Total vaccine doses, No (% of total No in cohort):696 420409 724286 696
 Dose 1296 826 (29.8)188 053 (48.6)108 773 (17.8)
 Dose 2238 608 (23.9)139 861 (36.1)98 747 (16.2)
 Dose 3160 986 (16.1)81 810 (21.1)79 176 (13.0)
Year of first vaccine dose, No (% of vaccinated):
 2006426 (0.1)248 (0.1)178 (0.2)
 200722 943 (7.7)6280 (3.3)16 663 (15.3)
 200841 799 (14.1)12 314 (6.5)29 485 (27.1)
 2009170 830 (57.6)133 571 (71.0)37 259 (34.3)
 201060 828 (20.5)35 640 (19.0)25 188 (23.2)
Data from vaccination registers572 696 (82.2)351 804 (85.9)220 892 (77.0)
Data from prescription registers123 724 (17.8)57 920 (14.1)65 804 (23.0)

Because of rounding, percentages may not total 100.