Table 3.

Crude and Adjusted Hazard Ratios of Type of Contraceptive Method and Additional Abortion, May 2010–December 2016

	Crude HR (95% CI)	Adjusted HRa (95% CI)
Contraception method
No contraception	Reference	Reference
Less effective methodsb	0.64 (0.16–2.67)	0.73 (0.18–3.01)
Depot medroxyprogesterone acetate injectionc	0.73 (0.41–1.29)	0.69 (0.39–1.23)
Oral contraceptive pill, patch, ring	1.58 (1.13–2.62)**	1.61 (1.14–2.28)**
Long-acting reversible contraceptionc	0.43 (0.21–0.89)*	0.41 (0.20–0.86)*
Sterilization	0.00**	0.00**
Race
Alaskan Native/Native American	4.73 (1.15–19.37)*	4.85 (1.17–20.11)*
Asian	Reference	Reference
Native Hawaiian/Pacific Islander	1.20 (0.83–1.72)	1.15 (0.80–1.65)
African American	0.85 (0.21–3.48)	0.89 (0.22–3.68)
White	0.99 (0.60–1.64)	0.94 (0.57–1.55)
No answer	1.24 (0.61–2.50)	1.16 (0.57–2.35)
Multiraciald	1.15 (0.55–2.42)	1.07 (0.51–2.24)
Age (years)
12–18	0.58 (0.31–1.10)	0.58 (0.31–1.11)
19–25	Reference	Reference
26–30	1.20 (0.83–1.75)	1.21 (0.83–1.77)
31–35	0.95 (0.60–1.52)	1.03 (0.64–1.64)
36 and older	0.52 (0.27–0.98)*	0.61 (0.32–1.16)
Insurance type
Privatee	0.77 (0.50–1.05)	0.71 (0.50–0.99)*
Publicf	Reference	Reference
Uninsured	0.29 (0.09–0.91)*	0.26 (0.08–0.82)*

Abbreviations: HR, hazards ratio; CI, confidence interval

^aAdjusted for race, age, and insurance type

^bIncludes abstinence, withdrawal, natural family planning, condoms, diaphragm, cervical cap, sponge

^cCommonly known as Depo-Provera and LARC, respectively

^dMultiracial means more than 1 race was selected

^ePrivate: Hawai‘i Medical Service Association (HMSA), Hawai‘i Mainland Administrators (HMA), University Health Alliance (UHA), Hawai‘i Medical Assurance Association (HMAA), Aetna

^fPublic: Medicaid, Medicare

^*P<.05

^**P<.01