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

Table 6 Body weight change (slope) for three age categories of Labrador retrievers up to death/censor date 31 July 2014

Longevity category	Up to 9 years			9–13 years			After 13 years
Longevity category	N	Mean (in kg/dog/year)	SEM	N	Mean (in kg/dog/year)	SEM	N	Mean (in kg/dog/year)	SEM
Expected (≥9 to ≤12.9 years)	13	0.59	0.3	13	−0.15	0.31		N/A
Long (≥13 to ≤15.5 years)	15	0.52	0.28	15	−0.91*	0.28	15	−1.41	0.68
Exceptional (>15.6 years)	11	0.4	0.36	11	0.53*	0.32	11	−1.31	0.74

Means within the 9–13 years column which share an asterisk (*) are significantly different (P = 0.007); none of the means within the other two columns (up to 9 years, after 13 years) show any significant differences among them (P > 0.05)
N number of dogs, SEM standard error of the mean