Table 3.

Univariable analysis of risk factors for discontinuation of baseline contraceptive method at 3 years

	Univariable model
	HR	95% CI
Contraceptive method
OCP	Reference
LNG-IUD	0.30	0.27	0.35
Cu-IUD	0.31	0.26	0.38
Implant	0.48	0.40	0.56
DMPA	1.01	0.85	1.20
Patch	1.21	0.94	1.56
Ring	1.12	0.96	1.30
Age
14–19	1.55	1.38	1.74
20+	Reference
Race
Black	1.20	1.09	1.32
White	Reference
Others	1.30	1.10	1.54
Education
≤High School	Reference
Some college	0.93	0.84	1.03
College grad	0.82	0.73	0.93
Body Mass Index
Underweight	1.18	0.92	1.51
Normal	Reference
Overweight	0.91	0.82	1.02
Obese	0.78	0.70	0.87
Low Socioeconomic Status
No	Reference
Yes	0.95	0.87	1.04
Insurance
None	1.07	0.97	1.18
Commercial	Ref
Public	1.04	0.90	1.20
Parity
0	1.38	1.27	1.51
1+	Reference
Prior Unintended Pregnancies
0	Reference
1+	0.79	0.72	0.87
History of STI
No	Reference
Yes	1.13	1.03	1.24

^aHR, hazard ratio

^bCI, confidence interval

^cOCP, oral contraceptive pill

^dLNG, levonorgestrel

^eIUD, intrauterine device

^fCu, copper

^gDMPA, depot medroxyprogesterone acetate

^hLow socioeconomic status is defined as trouble paying for basic needs (food, housing, medical care, transportation) or receiving government aid (food stamps, welfare)

ⁱSTI, sexually transmitted infection