Table 3. Risk factor analysis results when comparing ILI cases and non-ILI among pregnant women.
Co-variates were chosen based on initial univariate analyses (S3 Table). Estimates in bold indicate statistically significant co-variates.
| Hazard ratio (95% C.I) | |||
|---|---|---|---|
| Pregnant women and ILI episodes | Un-adjusted | Adjusted | |
| Trimester of symptom onset | 1st | 1 (ref) | 1 (ref) |
| 2nd | 0.52 (0.35–0.78) | 0.50 (0.34–0.75) | |
| 3rd | 0.38 (0.25–0.56) | 0.37 (0.25–0.55) | |
| Highest education attained | College or higher | 1 (ref) | 1 (ref) |
| High school or lower | 0.69 (0.45–1.04) | 0.92 (0.54–1.56) | |
| Employed # | 1 (ref) | 1 (ref) | |
| Employment status | Unemployed | 0.86 (0.59–1.26) | 1.00 (0.67–1.50) |
| Student | 0.54 (0.27–1.08) | 0.75 (0.31–1.81) | |
| A | 1 (ref) | 1 (ref) | |
| FGP | B | 1.46 (0.94–2.26) | 1.44 (0.91–2.28) |
| C | 1.34 (0.87–2.06) | 1.30 (0.85–1.99) | |
| D | 1.06 (0.65–1.74) | 1.13 (0.69–1.83) | |
| Age at enrolment | 1.02 (1.00–1.05) | 1.00 (0.97–1.03) | |
| Has any co-morbidity ^^ | 1.41 (1.04–1.91) | 1.43 (1.06–1.94) | |
| Classified as high risk pregnancy | 1.28 (0.94–1.73) | 1.15 (0.76–1.80) | |
| Has prior pregnancy | 1.32 (0.92–1.89) | 1.17 (0.76–1.80) | |
| Has kindergarten-age child (2 – 5yrs) in household | 1.19 (0.88–1.60) | 1.11 (0.81–1.51) | |
# Includes employment in power stations, coal mining, agriculture, offices, schools and healthcare
^^ Missing value for two participants