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Table 1 Characteristics of the study population. Girls offered HPV vaccine during 2009–2014 (n = 177,387)

From: Time trends in HPV vaccination according to country background: a nationwide register-based study among girls in Norway

  n (%)
HPV vaccine uptake
 Initiated 146,403 (82.5)
 Did not initiate 30,984 (17.5)
Country backgrounda
 Norway 158,738 (89.5)
 Western Europe 2072 (1.2)
 Central- and Eastern Europe 3887 (2.2)
 Middle East and North Africa 3729 (2.1)
 South-Asia 3355 (1.9)
 East−/South-East Asia 2236 (1.3)
 Sub-Saharan Africa 2775 (1.6)
 America and Oceania 595 (0.3)
Year of birth (Programme year)b
 1997 (2009) 30,209 (17.0)
 1998 (2010) 29,719 (16.8)
 1999 (2011) 30,100 (17.0)
 2000 (2012) 30,098 (17.0)
 2001 (2013) 28,932 (16.3)
 2002 (2014) 28,329 (16.0)
Parental education (years of schooling)
 Primary school/compulsory level (≤ 10) 32,865 (18.5)
 Upper secondary level (11–14) 66,711 (37.6)
 Higher education, undergraduate level (14–17) 63,003 (35.5)
 Higher education, graduate level (≥ 18) 14,808 (8.4)
Household income quintile (NOK)
 1 (≤ 575,319) 34,736 (19.6)
 2 (575,320–811,300) 35,412 (20.0)
 3 (811,301–988,227) 35,704 (20.1)
 4 (988,228–1,251,798) 35,778 (20.2)
 5 (≥ 1,251,799) 35,757 (20.2)
Number of siblings
 0 8203 (4.6)
 1 66,237 (37.3)
 2 62,468 (35.2)
 3 24,561 (13.9)
  ≥ 4 15,918 (9.0)
Maternal age at time of daughter’s birth (years)
  ≤ 25 38,939 (22.0)
 26–30 64,254 (36.2)
 31–35 51,947 (29.3)
  > 35 22,247 (12.5)
Region of residence
 Oslo 15,889 (9.0)
 Eastern-Norway 45,259 (25.5)
 Southern-Norway 34,892 (20.1)
 Western-Norway 39,283 (22.2)
 Mid-Norway 24,948 (14.1)
 Northern-Norway 17,116 (9.7)
  1. HPV Human papillomavirus
  2. aList of countries in each category is provided in the Supplementary table
  3. bEach programme year, the vaccine was offered to only one birth cohort