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Table 5 Simultaneous administration of EV71 vaccine 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 Total, N EV71 vaccination alone, N(%) Simultaneous administration of EV71 vaccine, N(%) χ2b Pb
with another vaccine with two or more vaccines
Total 329,569 323,716(98.22) 5712(1.73) 141(0.04)   
Dose of EV71
 1st dose 172,236 168,283(97.70) 3850(2.24) 103(0.06) 559.19 < 0.001
 2nd dose 157,333 155,433(98.79) 1862(1.18) 38(0.02)   
Sex
 Male 172,370 169,290(98.21) 3006(1.74) 74(0.04) 0.25 0.884
 Female 157,199 154,426(98.24) 2706(1.72) 67(0.04)   
Immigration status
 Resident children 170,670 169,283(99.19) 1368(0.80) 19(0.01) 1795.43 < 0.001
 Migrant childrena 158,899 154,433(97.19) 4344(2.73) 122(0.08)   
Urbanicity
 Inner 213,613 209,686(98.16) 3840(1.80) 87(0.04) 15.40 < 0.001
 Outer 115,956 114,030(98.34) 1872(1.61) 54(0.05)   
Age of vaccination
 6–12 months 119,754 116,886(97.61) 2804(2.34) 64(0.05) 444.21 < 0.001
 13–24 months 121,004 119,158(98.47) 1806(1.49) 40(0.03)   
 25–36 months 49,547 48,872(98.64) 661(1.33) 14(0.03)   
 37–59 months 39,261 38,797(98.82) 441(1.12) 23(0.06)   
Socioeconomic level of resident areas
 High 147,699 144,676(97.95) 2964(2.01) 59(0.04) 118.11 < 0.001
 Low 181,870 179,040(98.44) 2748(1.51) 82(0.05)   
Scale of immunization clinics
 Large-scaled 147,026 144,105(98.01) 2868(1.95) 53(0.04) 178.75 < 0.001
 Midsized 82,421 80,820(98.06) 1545(1.87) 56(0.07)   
 Small-sized 100,122 98,791(98.67) 1299(1.30) 32(0.03)   
  1. aMigrant children included the children from other cities of china and foreign countries
  2. bComparison of proportion of simultaneous administration in the population with different demographic characteristics was evaluated by Chi-square test