Table 1.
Meta-analysis characteristics of included studies reporting HPV vaccination and cervical cancer screening.
| Author, year | Period | Country | Quality score | Study design | RR | RR lower CI | RR upper CI | Vaccinated (n) | Unvaccinated (n) | Statistics |
|---|---|---|---|---|---|---|---|---|---|---|
| Ba et al[26] | 2006–2016 | US | 9 | Cohort | 1.34 | 1.33 | 1.35 | 190,982 | 763,928 | GEE |
| Kreusch et al[30] | 2006–2012 | Sweden | 8 | Cohort | 1.10 | 1.09 | 1.12 | 35,460 | 225,974 | Cox regression |
| Williams et al[31] | 2010 | US | 5 | Cross-sectional | 1.3 | 1.0 | 1.9 | Logistic regression | ||
| Paynter et al[27] | 2006–2009 | US | 7 | Cohort | 0.82 | 0.67 | 1.02 | 1154 | 1154 | Logistic regression |
| Sauer et al[29] | 2008–2013 | US | 5 | Cross-sectional | 1.08 | 1.04 | 1.11 | Predicted marginal model | ||
| Beer et al[32] | 2010–2012 | UK | 8 | Cohort | 1.72 | 1.64 | 1.81 | 149,666 | 15,916 | Logistic regression |
| Chao et al[7] | 2010–2013 | US | 8 | Cohort | 1.60 | 1.49 | 1.72 | 17,485 | 9867 | Logistic regression |
| Boone et al[34] | 2006–2009 | US | 7 | Cohort | 2.98 | 2.45 | 3.61 | 1123 | 1123 | Cox regression |
| Herweijer et al[28] | 2006–2012 | Sweden | 8 | Cohort | 1.05 | 1.02 | 1.08 | 4897 | 624,804 | Cox regression |
| Mather et al[33] | 2011 | Australia | 6 | Cross-sectional | 2.07 | 0.71 | 5.98 | 119 | 74 | Logistic regression |
| Baldur-Felskov et al[21] | 2006–2012 | Denmark | 7 | Cohort | 247,313 | 151,931 | Cox regression | |||
| Hirth et al[20] | 2006–2009 | US | 7 | Cohort | 1.44 | 1.09 | 1.92 | Logistic regression |
Missing vaccination information for Williams et al, Sauer et al, and Hirth et al. A study by Baldur-Felskov was added only in the crude pooled estimates. Methodological quality scores are explained in the methods section.
GEE = generalized estimating equation, RR = risk ratio.