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Table 3 Mean ages and body weights for the three longevity groups of dogs in July 2004

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

Longevity category N Mean body weight (kg) SD Min–max Mean age (years) SD Min–max
Expected (≥9 to ≤12.9 years) 13 29.4 4.6 20.2–37.40 6.5* 0.6 5.3–7.6
Long (≥13 to ≤15.5 years) 15 29.4 4.3 21.1–41.4 6.4# 0.9 5.4–7.9
Exceptional (≥15.6 years) 11 26.8 3.7 19.2–33.1 7.4*# 0.8 6.0–8.5
  1. Means among longevity groups were compared using analysis of variance with post hoc pairwise comparisons; mean body weights were not significantly different (P = 0.36) whilst means within the age column that share an asterisk (*) or a hash (#) were significantly different (P = 0.01)
  2. N number of dogs, SD standard deviation, Min–max range from minimum to maximum values