Table 5.
Predictors of a Positive Mumps Reverse-Transcription Polymerase Chain Reaction Test in Students With Probable or Confirmed Mumps, University of Iowa Student Mumps Cases, 13 July 2015–13 May 2016a
| Binary Regression | Multivariable Regression | |||||
|---|---|---|---|---|---|---|
| Predictor Variable | OR | (95% CI) | P Value | AOR | (95% CI) | P Value |
| Parotitis | 12.0 | (2.3–64.0) | .004 | 11.2 | (2.0–85.6) | .008 |
| Fever | 1.6 | (.86–3.1) | .14 | |||
| Any complication | 1.3 | (.35–4.5) | .73 | |||
| Illness length (each additional day) | 1.03 | (.94–1.2) | .55 | |||
| Severe illness | 1.09 | (.47–2.5) | .85 | |||
| Time to laboratory collection (each additional day) | 0.77 | (.65–.90) | .002 | 0.77 | (.65–.89) | .002 |
| Time between last MMR vaccine and illness (each additional year) | 1.05 | (.99–1.1) | .09 | |||
| Last MMR vaccination <180 d prior to illness onset | 0.38 | (.16–.93) | .03 | 0.34 | (.13–.92) | .03 |
Abbreviations: AOR, adjusted odds ratio; CI, confidence interval; MMR, measles-mumps-rubella; OR, odds ratio.
a
Two hundred twenty-one University of Iowa students had a mumps polymerase chain reaction test result.