Table 3. Univariable and Multivariable Logistic Regression .
| Variable | Univariable | Multivariable | ||
|---|---|---|---|---|
| OR (95% CI) | P value | OR (95% CI) | P value | |
| Sex | 0.91 (0.771-1.079) | .28 | 0.86 (0.718-1.035) | .11 |
| Age | 0.99 (0.989-0.998) | <.01 | 0.99 (0.987-0.999) | .02 |
| Educational level | ||||
| Low | 1 [Reference] | 1 [Reference] | ||
| Intermediate | 1.48 (1.168-1.881) | <.001 | 1.42 (1.085-1.846) | .01 |
| High | 2.68 (2.091-3.426) | <.001 | 2.55 (1.933-3.359) | <.001 |
| Self-perceived knowledge | ||||
| Inadequate | 1 [Reference] | 1 [Reference] | ||
| Sufficient | 2.30 (1.863-2.837) | <.001 | 2.01 (1.602-2.516) | <.001 |
| Good or excellent | 3.46 (2.789-4.279) | <.001 | 2.93 (2.315-3.708) | <.001 |
| KIRQ informationa | ||||
| B1. No. of imaging examinations (at least 1 in lifetime) | 1.72 (0.762-3.898) | .19 | 1.51 (1.110-2.061) | .009 |
| C3. Information received from health care professionals | 1.71 (1.431-2.034) | <.001 | 1.30 (1.072-1.565) | .007 |
| B2. No. of imaging examinations (≥3 in lifetime) | 1.30 (1.002-1.691) | <.05 | NA | NA |
| C2. Information about ionizing radiation received | 1.36 (1.212-1.518) | <.001 | NA | NA |
| C4. Information about ionizing radiation desired | 1.07 (1.015-1.133) | .01 | NA | NA |
| Geographic area | NA | NA | ||
| South/islands | 1 [Reference] | NA | NA | |
| Center | 1.14 (0.923-1.407) | .22 | NA | NA |
| North | 0.77 (0.623-1.045) | .06 | NA | NA |
Abbreviations: KIRQ, Knowledge About Ionizing Radiation Questionnaire; NA, not applicable; OR, odds ratio.
a
The survey consisted of 23 items grouped into 3 sections. Items labeled as “B” indicate knowledge, and items labeled as “C” indicate communication.