Association between symptom profiles and self-reported flu status and seropositive status
| Self-report status | Seropositive status | |
| OR (95% CI) | OR (95% CI) | |
| NZ sentinel surveillance definitions* | ||
| Adults (18+ years)§ | ||
| No or 1 symptom | Reference group | Reference group |
| 2 or 3 symptoms | 27.1 (13.6 to 53.6) | 0.93 (0.5 to 1.7) |
| Children (<18 years)¶ | ||
| No or 1 symptom | Reference group | Reference group |
| 2 or 3 symptoms | 21.5 (8.98 to 51.6) | 1.04 (0.52 to 1.09) |
| Healthcare workers** | ||
| No or 1 symptom | Reference group | Reference group |
| 2 or 3 symptoms | 18.2 (10.3 to 32.1) | 1.19 (0.75 to 1.9) |
| Ministry of Health (MoH) definition† | ||
| Adults (18+ years)§ | ||
| Met MoH definition | 11.5 (6.1 to 21.8) | 1.3 (0.7 to 2.3) |
| Did not meet definition | Reference group | Reference group |
| Children (<18 years)¶ | ||
| Met MoH definition | 9.5 (4.5 to 20) | 0.8 (0.4 to 1.4) |
| Did not meet definition | Reference group | Reference group |
| Healthcare workers** | ||
| Met MoH definition | 13.3 (7.4 to 23.9) | 1.46 (0.9 to 2.4) |
| Did not meet definition | Reference group | Reference group |
ORs and 95% CI derived from independent logistic regression models.
↵* Two or more symptoms from: fever, muscle ache and headache.
↵† Fever, plus cough and/or sore throat.
‡Self-diagnosis, assisted-self-diagnosis or self-diagnosis by proxy.
↵§ Adults: 16 ‘don't know’ respondents on self-reported influenza status were excluded from analysis.
↵¶ Children: 21 ‘don't know’ respondents on self-reported influenza status were excluded from analysis.
↵** Healthcare workers: 22 ‘don't know’ respondents on self-reported influenza status and five respondents missing immunological status were excluded from analysis.