Descriptive statistics for age at death of the four groups of dogs and results of survival analysis
| Group | Descriptive statistics | Survival analysis | ||||
| N | Median age* | (Min-Max) | N | MST† | (95% CI) | |
| Longevity study | 39 | 14.01a | (9.68–17.90) | 39 | 14.01a | (13.18 to 14.77) |
| KC survey | 574 | 12.25b | (0.17–19.00) | 542 | 12.58b | (12.17 to 12.92) |
| ‘Restricted’ | 24 | 12.95b | (4.30–14.56) | 24 | 12.90b | (12.38 to 13.40) |
| ‘Control’ | 24 | 11.16b | (3.50–13.29) | 24 | 11.14c | (10.80 to 11.99) |
*Kruskal-Wallis analysis of variance (P< 0.0001) with post hoc Dunn’s pairwise comparisons: median ages with different superscripts are significantly different from one another.
†MST; Kaplan-Meier log rank P<0.0001; MSTs with different superscripts are significantly different from one another (P≤0.004).
CI, confidence interval; KC, Kennel Club; MST, median survival time.