Table 5.

Factors associated with Penta 3 timeliness.

Characteristics			Hanoi (n=69,301)					Son La (n=11,918)
			Odds ratio (95% CI)		P value		Odds ratio (95% CI)			P value
Survey round
	Preintervention	Reference		N/Aa		Reference			N/A
	Postintervention	1.18 (1.13-1.22)		<.001		1.69 (1.56-1.81)			<.001
Child’s gender
	Girl	Reference		N/A		Reference			N/A
	Boy	1.0 (0.98-1.04)		.49		1.0 (0.96-1.12)			.32
Ethnicity
	Kinh	1.1 (0.83-1.44)		.52		1.1 (0.98-1.20)			.12
	Thai	0.7 (0.28-1.78)		.46		1.3 (1.21-1.44)			<.001
	Other ethnicities	Reference		N/A		Reference			N/A
Region
	Rural	Reference		N/A		Reference			N/A
	Urban	1.6 (1.51-1.62)		<.001		N/A			N/A
Vaccinated mostly from
	Commune health center	Reference		N/A		Reference			N/A
	Fee-based facility	2.7 (2.62-2.82)		<.001		1.59 (1.1-2.3)			.01

^aN/A: not applicable.