Table 4a.

Logistic Generalized Estimating Equation for ever had pertussis vaccination versus multiple predictors/confounders, accounting for clustering on ward

		Univariate Model		Multivariate Model
Variable	Level	Odds Ratio (95% CI)	Stepdown Bonferroni P value	Adjusted Odds Ratio (95% CI)	Global P value
Age	31–40	0.60 (0.44, 0.82)	0.005
	41–50	0.54 (0.28, 1.04)
	>50	0.50 (0.25, 1.03)
	21–30	1.0
Highest Education Level	Bachelor vs Diploma or less	2.97 (1.87, 4.71)	<0.001
	Bachelor	1.65 (1.01, 2.69)
	Diploma or less	0.56 (0.26, 1.17)
	Postgraduate	1.0
Length of time in health sector	<12 months	2.25 (0.47, 10.67)	<0.001	2.75 (0.59, 12.80)	<0.001
	1–5 years	1.50 (0.51, 4.45)		3.35 (0.51, 21.99)
	6–10 years	2.25 (1.43, 3.54)		0.92 (0.41, 2.08)
	11–15 years	2.70 (1.11, 6.57)		1.37 (0.52, 3.62)
	16+ years	1.0		1.0
Length of time in area of work	<12 months	3.66 (1.28, 10.46)	<0.001
	1–5 years	1.32 (0.55, 3.19)
	6–10 years	1.81 (1.16, 2.81)
	11–15 years	2.71 (0.56, 13.02)
	16+ years	1.0
Received Hepatitis B vaccine	Yes	11.22 (5.23, 24.07)	<0.001	18.16 (3.38, 97.47)	<0.001
	No	1.0		1.0
Received MMR vaccine	Yes	12.19 (4.48, 33.18)	0.001	9.35 (4.14, 21.13)	<0.001
	No	1.0	-	1.0
Received Hepatitis A vaccine	Yes	5.46 (2.77, 10.77)	<0.001
	No	1.0	-
How severe do you think influenza infections in infants can be?	For every 1 point increase in severity	1.36 (1.18, 1.57)	0.002	1.63 (1.07, 2.49)	0.023