Table 4.

Factors associated with probability of contraception failure after 1 year of use among drinkers (n = 465).^a,b

	Odds ratio (95% CI of odds)	p value
Ethnicity
NZ European/otherc
Māori/Pacific	0.62 (0.15–2.64)	0.518
Asian	0.77 (0.14–4.3)	0.773
Age in years
30–35c
18–24	0.77 (0.35–1.71)	0.52
25–29	1.44(0.66–3.14)	0.36
Highest level of education
Some or completed tertiary educationc
No tertiary education	1.75 (0.99–3.08)	0.055
Age *ethnicity
18–24 years and Māori/Pacific	5.99 (1.15–31.2)	0.033
Six or more standard drinks on one occasion at least monthly or less
Neverc
Monthly or less	0.38 (0.21–0.67)	< 0.001
Weekly or more often	0.75 (0.31–1.80)	0.517

CI: confidence incidence.

^aBinary logistic regression.

^bMissing = 21.

^cReference category.

^*Interaction.