Table 4:

Association of lower versus higher annual household income on contraceptive methods

Primary outcome	Household income; weighted frequencies		Crude RR (95% CI) for lower-income group	Adjusted RR^* (95% CI) for lower-income group
Primary outcome	< $80 000 n = 516 241	≥ $80 000 n = 310 470	Crude RR (95% CI) for lower-income group	Adjusted RR^* (95% CI) for lower-income group
Oral contraceptives	275 176	214 080	0.77 (0.72–0.83)	0.85 (0.80–0.91)
Injectable contraceptives (DMPA)	15 573	4772	1.96 (1.16–3.32)	1.69 (0.98–2.92)
Condom only	97 682	41 363	1.42 (1.16–1.74)	1.36 (1.11–1.67)
Nonusers (no contraceptive method)	79 856	32 654	1.47 (1.17–1.84)	1.19 (0.94–1.50)
Multiple methods: condoms plus oral contraceptives or DMPA	126 256	113 766	0.67 (0.59–0.75)	0.81 (0.71–0.91)

Note: CI = confidence interval, DMPA = depot medroxyprogesterone acetate, RR = relative risk.
↵* Adjusted for household income, age, race/ethnicity, immigrant status, student status, marital status, household level of education and northern residence.