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Table 4 Number of Labrador retrievers, age at death/censor date and median survival time with 95 % CIs

From: Exceptional longevity and potential determinants of successful ageing in a cohort of 39 Labrador retrievers: results of a prospective longitudinal study

Longevity category Descriptive statistics for age in years at death/censor datea MST (95 % CI) in years from Kaplan–Meier analysis
N (%) Mean (SD) Median (min–max)
Expected ≥9 to ≤12.9 Deceased 13 (33 %) 12.08* (1.04) 12.58* (9.68–12.95) 12.44* (11.70–12.80)
Long ≥13 to ≤15.5 Deceased 15 (39 %) 14.21* (0.58) 14.15* (13.18–15.19) 14.08* (13.63–14.72)
Exceptional ≥15.6 Deceased 6 15.98 (0.49) 15.80 (15.68–16.96)  
Alivea 5 16.82 (0.65) 17.13 (16.04–17.50)  
Sub-total 11 (28 %) 16.36* (0.69) 16.04* (15.68–17.50) 16.47* (15.76–NE)
Overall Overall 39 (100 %) 14.11 (1.86) 14.01 (9.68–17.50) 14.01 (13.18–14.77)
  1. Within each column (mean, median, MST), values which share an asterisk (*) are each significantly different from one another (P < 0.0001) by parametric and non-parametric analysis of variance for age at death/censor date and by Kaplan–Meier survival analysis; values within a column with no asterisk were not compared
  2. CI confidence interval, NE not estimated using Statistix commercial software
  3. aJuly 31, 2014