Table 2.
Crude, adjusted, and stratum-specific odds ratios (ORs) for receiving a PCR test, by respiratory syncytial virus (RSV) season and age group, 2013-2017, Arizona a
| Variable | Crude OR (95% CI) | Adjusted OR (95% CI) |
|---|---|---|
| RSV season | ||
| 2013-2014 | 1.00 [Reference] | 1.00 [Reference] |
| 2014-2015 | 2.9 (2.7-3.3) | 2.9 (2.6-3.3) |
| 2015-2016 | 3.7 (3.3-4.2) | 3.5 (3.1-3.9) |
| 2016-2017 | 4.3 (3.9-4.8) | 3.9 (3.5-4.4) |
| Age group, y | ||
| 0-4 | 1.00 [Reference] | 1.00 [Reference] |
| 5-14 | 3.8 (3.2-4.5) | 3.8 (3.2-4.6) |
| 15-64 | 6.2 (5.3-7.2) | 5.9 (5.1-6.9) |
| ≥65 | 8.8 (7.6-10.2) | 8.1 (7.0-9.5) |
| Stratum-specific with interaction b | ||
| 2013-2014 and age ≥65 | 1.00 [Reference] | 1.00 [Reference] |
| 2014-2015 and age ≥65 | — c | 15.9 (11.8-21.4) |
| 2015-2016 and age ≥65 | — c | 36.4 (26.2-50.6) |
| 2016-2017 and age ≥65 | — c | 35.2 (26.6-46.4) |
Abbreviation: PCR, polymerase chain reaction.
aData source: Arizona Department of Health Services. 15
b P = .001. A type 3 joint test was used to determine significance, with P < .05 considered significant.
cStratum-specific terms with interaction can be assessed only in the adjusted model. Includes 1 test per case.