Impact of methodological

Table 5 Effect of conducting follow-up for households not available at initial visit. Commonwealth of the Northern Mariana Islands, 2005.

	Study Conducted
	Without Follow-up	With Follow-up
Number of households with known eligibility	3259	3863
Percentage of households with known eligibility	79.3%	94.0%
Number of eligible households	532	724
Percentage of households eligible	16.3%	18.7%
Number of children
1 year	175	224
2 years	145	194
6 years	151	193
Estimated % of children vaccinated* (95% CI)
1 year	91.5% (87.6, 95.4)	91.8% (88.3, 95.3)
2 years	80.2% (73.9, 86.5)	82.4% (77.3, 87.5)
6 years	83.3% (77.6, 89.0)	83.0% (77.9, 88.1)

*Children aged 1 year: received at least 3 doses of diphtheria-pertussis-tetanus vaccine (DPT), 3 doses of inactivated poliovirus vaccine (IPV), 2 doses of Haemophilus influenzae type b vaccine (Hib) and 3 doses of hepatitis B vaccine. Children aged 2 years: received at least 4 doses of DPT, 3 doses of IPV, 1 dose of measles-mumps-rubella vaccine (MMR), 3 doses of Hib, and 3 doses of hepatitis B. Children aged 6 years: received at least 5 doses DPT, 4 doses of IPV, 2 doses of MMR, and 3 doses of hepatitis B vaccine.

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