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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