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Table 4 Two-doses EV71 vaccine series completion status among children born during 2012–2018 in Ningbo, China

From: Vaccination coverage estimates and utilization patterns of inactivated enterovirus 71 vaccine post vaccine introduction in Ningbo, China

Characteristics Series completed Series completed on-timea
No. rate %(95%CI) No. rate %(95%CI)
Total 157,333 21.97(21.87–22.06) 46,448 6.49(6.43–6.54)
Sex
 Male 82,246 21.69(21.56–21.83) 23,996 6.33(6.25–6.41)
 Female 75,087 22.28(22.14–22.42) 22,452 6.66(6.58–6.75)
Immigration status
 Resident children 82,735 24.69(24.54–24.83) 26,928 8.04(7.94–8.13)
 Migrant children 74,472 19.58(19.45–19.71) 19,482 5.12(5.05–5.19)
 Foreign children 126 17.50(14.79–20.48) 38 5.28(3.76–7.17)
Urbanicity
 Inner 102,624 25.86(25.73–26.00) 33,808 8.52(8.43–8.61)
 Outer 54,709 17.13(17.00–17.26) 12,640 3.96(3.89–4.03)
Birth year
 2012 386 0.38(0.34–0.42) N/A N/A
 2013 2223 2.32(2.22–2.41) N/A N/A
 2014 9560 8.88(8.71–9.05) N/A N/A
 2015 20,661 21.21(20.95–21.46) 108 0.11(0.09–0.13)
 2016 39,717 35.62(35.34–35.91) 7437 6.67(6.52–6.82)
 2017 47,836 45.17(44.87–45.47) 16,438 15.52(15.31–15.74)
 2018 36,950 38.78(38.47–39.09) 22,465 23.58(23.31–23.85)
Socioeconomic level of resident areas
 High 71,143 27.52(27.35–27.70) 25,438 9.84(9.73–9.96)
 Low 86,190 18.83(18.72–18.94) 21,010 4.59(4.53–4.65)
Scale of immunization clinics
 Large-scaled 70,339 22.43(22.28–22.58) 24,404 7.78(7.69–7.88)
 Midsized 39,142 21.65(21.46–21.84) 8998 4.98(4.88–5.08)
 Small-sized 47,852 21.58(21.41–21.75) 13,046 5.88(5.78–5.98)
  1. aSeries completed on-time was defined as completing 2-dose of EV71 vaccination during 6-12 months of age