Table 3.
Multiple logistic regression analysis
| Factor | OR estimate | OR 95% CI | p-value | |
|---|---|---|---|---|
| Time using the current method, months (continuous variable) |
1.006 |
1.004–1.008 |
<0.0001 |
|
| Contraceptive method |
Pill vs vaginal ring |
4.175 |
3.683–4.732 |
<0.0001 |
| Patch vs vaginal ring |
1.648 |
1.362–1.994 |
||
| Pill vs Patch |
2.534 |
2.128–3.016 |
||
| Information on treatment |
Not very informed |
1.931 |
1.336–2.791 |
<0.0001 |
| (reference: very informed) |
Normal |
1.532 |
1.370–1.713 |
|
| Interest in not becoming pregnant |
Very interested |
1.161 |
1.012–1.332 |
<0.0001 |
| (reference: interested) |
Prefer not to get pregnant |
1.273 |
1.057–1.534 |
|
| Not mind |
1.455 |
1.001–2.117 |
||
| Partner support |
Absence of partner |
1.415 |
1.195–1.676 |
<0.0001 |
| (reference: always reminding) |
Indifferent |
1.416 |
1.205–1.664 |
|
| Sometimes |
1.372 |
1.214–1.550 |
||
| Understanding of information and instructions |
Not interested |
2.137 |
0.182–25.052 |
0.0089 |
| (reference: complete understanding) |
Anything |
1.066 |
0.283–4.014 |
|
| Not understanding a lot of things |
1.696 |
1.213–2.371 |
||
| Understanding almost all |
1.167 |
1.032–1.318 |
||
| Belief that participation would avoid forgetfulness/delays |
More vs The same |
1.072 |
0.865–1.329 |
<0.0001 |
| Less vs The same |
1.298 |
1.167–1.444 |
||
| Less vs More |
1.211 |
0.977–1.501 |
||
| Routine method |
Other |
1.142 |
0.902–1.447 |
<0.0001 |
| (reference: at the same hour each day of the week/month) |
Not interested |
1.470 |
1.003–2.154 |
|
| Considered but not organized |
3.873 |
2.997–5.004 |
||
| Activity reminding treatment |
0.846 |
0.740–0.968 |
||
| Difficulties remembering to take/use/remove the contraceptive method |
During the week, from Monday to Friday |
6.189 |
4.982–7.687 |
<0.0001 |
| (reference: none) |
On vacation |
2.132 |
1.851–2.455 |
<0.0001 |
| On weekend |
3.392 |
2.934–3.921 |
<0.0001 |
|
| On short trips |
1.563 |
1.306–1.871 |
<0.0001 |
|
| Going out the night before |
2.099 |
1.762–2.501 |
<0.0001 |
|
| Travelling to a different time zone | 1.403 | 1.106–1.780 | <0.0001 | |
Goodness-of-fit (Hosmer-Lemeshow): p-value = 0.7004.
Discrimination test: p-value = 0.7830.
Abbreviations: CI Confidence Interval.
Probability modeled is noncompliance (code = 1).