Table 5.
The effect of population characteristics and the career racing and performance history on whether retirement was voluntary for 110 retired thoroughbred racehorses in South East Queensland.
| Variable | Univariable OR (95% CI) | p-Value | Adjusted OR (95% CI) | p-Value |
|---|---|---|---|---|
| Age (years) | 1.30 (1.01, 1.69) | 0.04 | ||
| Sex | ||||
| Stallions | reference | - | ||
| Mares | 1.62 (0.14, 19.07) | 0.70 | ||
| Geldings | 2.29 (0.20, 26.58) | 0.50 | ||
| Had a race start | ||||
| No | reference | - | ||
| Yes | 1.18 (0.34, 4.11) | 0.80 | ||
| Started as two-year-old | ||||
| Yes | reference | - | ||
| No | 2.23 (0.99, 5.05) | 0.05 | ||
| Number starts as two-year-old | 1.08 (0.83, 1.40) | 0.60 | ||
| Age at first race (years) | 1.81 (0.93, 3.55) | 0.08 | ||
| Length of career (months) | 1.02 (0.99, 1.04) | 0.19 | ||
| Number of starts | 1.04 (1.01, 1.07) | 0.01 | 1.05 (1.02, 1.10) | 0.01 |
| Starts per year | 1.30 (1.11, 1.53) | 0.00 | 1.21 (1.02, 1.46) | 0.03 |
| Total race distance accumulated (5 furlongs/1 km) | 1.02 (1.00, 1.04) | 0.02 | ||
| Average distance per start (furlongs) | 1.26 (0.90, 1.77) | 0.18 | ||
| Number of races won | 1.04 (0.90, 1.20) | 0.60 | ||
| % of races won | 0.94 (0.90, 0.99) | 0.02 | ||
| Number of races 1st, 2nd or 3rd place | 1.03 (0.97, 1.08) | 0.30 | ||
| % of races 1st, 2nd or 3rd place | 0.96 (0.94, 0.99) | 0.00 | 0.94 (0.91, 0.97) | <0.001 |
| Total prizemoney ($1000 AUD) | 1.00 (1.00, 1.00) | 0.30 | ||
| Prizemoney per start ($1000 AUD) | 0.98 (0.91, 1.04) | 0.50 | ||
| Retired as two-year-old | ||||
| No | reference | - | ||
| Yes | 0.51 (0.04, 5.79) | 0.60 |
Univariable and multivariable logistic regression models shown. In the univariable analyses, variables were considered significant at α = 0.2 and eligible for inclusion in the multivariable model. In the multivariable analysis, variables significant at α = 0.05 were retained in the final model. Significant variables are indicated in bold.