We analyzed NHANES 2003–2010 data and considered years
2003–2006 the pre-vaccine era and years 2007–2010 the vaccine
era. All female subjects aged 14–59 years selected for NHANES
2003–2010 were eligible for serological testing. In the pre-vaccine
era, 5178 females aged 14–59 years were interviewed; 4990
(96.4%) received a physical examination and 4531 (87.5%) serum
samples were collected and analyzed. In the vaccine era,
4988 females aged 14–59 years were interviewed; 4860 (97.8%)
received a physical examination and 4457 (89.7%) serum samples
were collected and analyzed.