Table 1.
Descriptive statistics and results from univariate logistic regression modelling EEEV serological status associated with individual variables using the serosurvey dataset (model 1)
| Categorical predictors | Count | OR | 95% CI | P value | |
|---|---|---|---|---|---|
| Seropositive | Seronegative | ||||
| Breed* | |||||
| Arabian | 2 | 2 | 12·0 | 0·86–168 | 0·07 |
| Other breed | 13 | 173 | Ref. | ||
| Sex | |||||
| Female | 6 | 89 | 0·64 | 0·21–1·91 | 0·42 |
| Male | 9 | 86 | Ref. | ||
| Use of mosquito repellent | |||||
| Never | 8 | 93 | Ref. | ||
| Occasionally | 7 | 82 | 0·85 | 0·23–3·19 | 0·82 |
| Screens on doors and windows | |||||
| Yes | 3 | 18 | Ref. | ||
| No | 4 | 70 | 0·98 | 0·13–7·73 | 0·99 |
| n.a. (24 h outside daily) | 8 | 87 | |||
| Use of protective fly sheets | |||||
| Never | 14 | 161 | Ref. | ||
| Occasionally | 1 | 14 | 0·46 | 0·007–31·8 | 0·72 |
| Mean | |||||
| Continuous predictors | Seropositive | Seronegative | OR | 95% CI | P value |
| Time spent outside daily (hours) | 18·3 | 16·1 | 1·06 | 0·95–1·17 | 0·304 |
| Age (years) | 11·9 | 9·8 | 1·05 | 1·00–1·10 | 0·037 |
EEEV, Eastern equine encephalitis virus; OR, odds ratio (given by generalized estimating equations with an exchangeable correlation structure); CI, confidence interval; Ref., reference category; n.a.., not applicable.
*
Ten breed categories were initially reported in the questionnaires. There was no statistically significant difference between breeds at P < 0·20 except for Arabian horses on univariate logistic regression.