Table 3.
Prevalence of delayed vaccination in children 12–23 months registered in the Nairobi Urban Health and Demographic Surveillance System before, during, and after PCV introduction according to demographic factors
| BCG | Penta1 | Penta2 | Penta3 | OPV1 | OPV2 | OPV3 | Measles | |
|---|---|---|---|---|---|---|---|---|
| % delayed (total number of children vaccinated) | ||||||||
| Overall delay | 13.8 (5,219) | 8.1 (5,131) | 12.6 (4,962) | 18.2 (4,705) | 11.4 (5,101) | 15.6 (4,917) | 20.8 (4,621) | 54.0 (3,811) |
| Study site | ||||||||
| Korogocho | 15.3 (2,563) | 10.5 (2,494) | 17.0 (2,378) | 25.0 (2,213) | 15.2 (2,470) | 21.6 (2,345) | 29.3 (2,150) | 55.5 (1,691) |
| Viwandani | 12.3 (2,656) | 5.7 (2,637) | 8.4 (2,584) | 12.1 (2,492) | 7.8 (2,631) | 10.2 (2,572) | 13.4 (2,471) | 52.8 (2,120) |
| Sex | ||||||||
| Male | 13.6 (2,664) | 8.7 (2,611) | 13.3 (2,520) | 18.7 (2,375) | 11.6 (2,587) | 15.7 (2,505) | 21.1 (2,329) | 54.5 (1,935) |
| Female | 13.9 (2,555) | 7.4 (2,520) | 11.8 (2,442) | 17.6 (2,330) | 11.1 (2,514) | 15.6 (2,412) | 20.5 (2,292) | 53.5 (1,876) |
| Ethnicity | ||||||||
| Kikuyu | 8.9 (1,369) | 5.2 (1,348) | 7.5 (1,322) | 12.6 (1,265) | 9.7 (1,337) | 12.6 (1,306) | 17.4 (1,240) | 51.0 (1,006) |
| Luhya | 20.6 (1,045) | 12.3 (1,038) | 19.6 (1,001) | 26.3 (947) | 15.3 (1,030) | 20.9 (990) | 27.5 (932) | 54.8 (786) |
| Luo | 18.3 (895) | 9.9 (865) | 16.7 (810) | 23.9 (752) | 13.3 (860) | 20.2 (801) | 27.6 (736) | 52.9 (569) |
| Kamba | 10.3 (1,092) | 5.0 (1,080) | 7.6 (1,060) | 12.1 (1,022) | 7.2 (1,077) | 9.9 (1,056) | 13.6 (1,007) | 53.0 (869) |
| Kissii | 9.1 (309) | 6.2 (308) | 9.5 (304) | 11.6 (293) | 7.8 (308) | 10.9 (304) | 11.5 (287) | 58.8 (257) |
| Other | 15.1 (509) | 11.6 (492) | 17.8 (465) | 25.4 (426) | 15.3 (489) | 21.3 (460) | 27.7 (419) | 62.0 (324) |
| Wealth quintile | ||||||||
| Poorest | 17.7 (651) | 11.2 (633) | 15.5 (612) | 21.4 (579) | 14.0 (637) | 18.4 (609) | 25.3 (570) | 54.8 (473) |
| Poor | 14.9 (863) | 7.9 (857) | 13.7 (827) | 19.5 (780) | 11.4 (853) | 17.2 (821) | 22.6 (769) | 55.4 (643) |
| Middle | 15.8 (998) | 8.8 (980) | 13.3 (945) | 20.0 (887) | 12.8 (974) | 17.7 (930) | 23.8 (858) | 57.1 (718) |
| Rich | 11.9 (1,251) | 7.8 (1,234) | 11.5 (1,194) | 16.6 (1,134) | 10.6 (1,220) | 14.1 (1,186) | 18.1 (1,119) | 51.9 (919) |
| Richest | 11.5 (1,456) | 6.5 (1,427) | 11.0 (1,384) | 16.1 (1,325) | 9.8 (1,417) | 13.4 (1,371) | 18.2 (1,305) | 52.6 (1,058) |
| Time period | ||||||||
| 2007–2010 (pre-intro) | 20.1 (1,883) | 10.8 (1,818) | 15.8 (1,760) | 23.4 (1,650) | 14.4 (1,809) | 19.6 (1,738) | 27.7 (1,621) | 56.9 (1,358) |
| 2011 (during) | 10.4 (1,011) | 6.8 (1,001) | 11.7 (967) | 17.6 (907) | 13.1 (984) | 18.4 (946) | 22.7 (867) | 50.6 (770) |
| 2012–2015 (post-intro) | 10.2 (2,325) | 6.4 (2,312) | 10.4 (2,235) | 14.3 (2,148) | 8.2 (2,208) | 11.4 (2,233) | 14.8 (2,133) | 53.2 (1,683) |
| Children | ||||||||
| With date on card (denominator) | 5,219 | 5,131 | 4,962 | 4,705 | 5101 | 4,917 | 4,621 | 3,811 |
| Who received vaccine | 5,254 | 5,218 | 5,098 | 4,907 | 5,202 | 5,065 | 4,879 | 4,214 |
| Who did not receive vaccine | 87 | 123 | 243 | 434 | 139 | 276 | 462 | 1,127 |
| Total | 5,341 | 5,341 | 5,341 | 5,341 | 5,341 | 5,341 | 5,341 | 5,341 |
BCG = Bacille Calmette-Guerin; OPV = oral polio vaccine.