Table 3

Multivariate analysis of practice structure and organisation factors and their associations with practice immunisation coverage and timeliness.

	Practice immunisation coverage^a		Practice immunisation timeliness^b

	Coefficient (95% CIs)	P-value	Coefficient (95% CIs)	P-value
Region
Auckland	−0.091 (−0.147 to −0.036)	0.002	−0.029 (−0.083 to 0.026)	0.31
Midland	–		–

Practice governance
Maori	−0.073 (−0.155 to 0.001)	0.09	−0.096 (−0.177 to −0.015)	0.02
Non-Maori	–		–

% of registered patients in most socioeconomically deprived quintile^c	−0.003 (−0.004 to −0.001)	<0.001	−0.003 (−0.003 to −0.003)	<0.001

Median age of children at practice	−0.001 (−0.001 to 0.000)	0.13	0.001 (0.000 to 0.001)	0.046

Median age of children at time of registration with practice	−0.001 (−0.002 to −0.001)	0.002	−0.001 (−0.001 to −0.001)	0.007

Practice management system used
Medtech32	0.215 (0.105 to 0.324)	<0.001	0.154 (0.047 to 0.26)	0.006
Other	–		–

Practice experiences staff shortages
Yes	−0.074 (−0.138 to −0.010)	0.027	−0.076 (−0.139 to −0.013)	0.02
No	–		–

↵a Data from 95 practices in multivariate model, r² for model = 0.60.
↵b Data from 95 practices in multivariate model, r² for model = 0.45.
↵c Socioeconomic deprivation measured using the NZDep2001 Index of Deprivation, a small area-based measure that combines nine variables from the 2001 Census that reflect aspects of material and social deprivation.19