Table 3.

Multivariate analysis of decayed, missing or filled primary teeth (dmft) according to year, fluoridation status and socio-economic characteristics^‡

Variable	2008		2010		2012
	IRR	95% CI	IRR	95% CI	IRR	95% CI
Fluoridation status
Fluoridated	1.00†		1.00†		1.00†
Newly fluoridated	1.47***	1.20–1.80	1.41**	1.10–1.80	1.11NS	0.85–1.45
Unfluoridated	2.06***	1.48–2.85	2.81***	2.16–3.64	2.23***	1.66–2.98
Indigenous status
Non-Aboriginal	1.00†		1.00†		1.00†
Aboriginal	1.29NS	0.88–1.89	1.38NS	0.96–1.97	1.83**	1.24–2.71
Cardholder status
Non-cardholder	1.00†		1.00†		1.00†
Cardholder	1.57***	1.29–1.91	1.74***	1.41–2.13	1.73***	1.37–2.18
Maternal country of birth
English speaking	1.00†		1.00†		1.00†
Non-English speaking	1.70**	1.17–2.45	2.07***	1.43–3.00	1.58*	1.06–2.36
Highest educational attainment of parent(s)§
Bachelor’s and higher	–	–	1.00†		1.00†
Certificate/Diploma	–	–	1.28*	1.01–1.63	1.20NS	0.92–1.57
Year 12 or below	–	–	1.51**	1.14–1.99	1.61**	1.17–2.22
Toothbrushing behaviour
Twice or more a day	1.00†		1.00†		1.00†
Once or less a day	1.01NS	0.83–1.24	1.12NS	0.91–1.38	1.31*	1.04–1.65
Sugary drink consumption
None	1.00†		1.00†		1.00†
One or more a day	1.50***	1.22–1.84	1.50***	1.23–1.83	1.47**	1.17–1.86

IRR, incidence rate ratio; NS, not significant.

^*PP < 0.05.

^**P < 0.01.

^***P < 0.001.

^†Referent.

^‡Adjusted for age and gender.

^§Highest educational attainment of parents was not asked in 2008.