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Table 1 Distribution of characteristics of the study population, 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

Demographics No. Frequency(%)
Total 716,178 100.00
Sex
 Male 379,102 52.93
 Female 337,076 47.07
Immigration status
 Resident children 335,120 46.79
 Migrant children 380,338 53.11
 Foreign children 720 0.10
Urbanicity
 Inner 396,782 55.40
 Outer 319,396 44.60
Birth year
 2012 102,425 14.30
 2013 95,979 13.40
 2014 107,674 15.03
 2015 97,433 13.60
 2016 111,492 15.57
 2017 105,894 14.79
 2018 95,281 13.30
Socioeconomic level of resident areas
 High 258,474 36.09
 Low 457,704 63.91
Scale of immunization clinics
 Large-scaled 313,599 43.79
 Midsized 180,796 25.24
 Small-sized 221,783 30.97