Volume 17, Number 9—September 2011
Research
Intrahousehold Transmission of Pandemic (H1N1) 2009 Virus, Victoria, Australia
Table 5
Variable | OR (95% CI) | p value |
---|---|---|
Individual level | ||
Sex | ||
M | 1.00 | |
F | 2.70 (1.060–6.860) | 0.037 |
Age, y | ||
0–4 | 1.00 | |
5–19 | 2.06 (0.179–23.90) | 0.560 |
20–49 | 1.79 (0.228–14.00) | 0.581 |
>50 | 1.11 (0.529–23.30) | 0.946 |
Relationship to index case-patient | ||
Parent/child/partner | 1.00 | |
Sibling | 1.22 (0.562–2.660) | 0.613 |
Other family member |
† |
|
Reported prevention and control measures | ||
Antiviral prophylaxis‡ | 0.05 (0.006–0.429) | 0.006 |
Quarantined for >1 d
with index case-patient§ |
1.22 (1.03–1.44) |
0.019 |
Household level | ||
No. persons | ||
2–3 | 1.00 | |
4–5 | 0.385 (0.035–4.280) | 0.437 |
>6 | 0.441 (0.024–8.070) | 0.581 |
No. children | ||
1 | 1.00 | |
2 | 0.729 (0.163–3.260) | 0.679 |
>3 | 0.534 (0.05–5.74) | 0.605 |
Cultural and linguistic diversity | ||
Only English spoken at home | 1.00 | |
English and/or other language(s) spoken at home | 2.23 (0.448–11.100) | 0.328 |
*Backwards stepwise selection procedures were used to develop the final adjusted model whereby predictors (p>0.05) were removed sequentially until only significant predictors (p<0.05) remained. Gender was not significant in the adjusted model (p = 0.83) and was thus removed. Goodness of fit for both models was assessed by using the Hosmer and Lemeshow test to 0.05 significance. Goodness of fit for the final model was 0.2. OR, odds ratio; CI, confidence interval.
†No secondary cases occurred in this group, and this level is not included in the unadjusted model.
‡Adjusted OR 0.042 (95% CI 0.004–0.434); p = 0.008.
§Logistic regression using number of days quarantined with index case-patient as continuous exposure. Adjusted OR 1.25 (95% CI 1.06–1.47); p = 0.008.
1Current affiliation: La Trobe University, Melbourne, Victoria, Australia.