Table 2. Descriptive statistics of the lifespan of the three types of dogs (mongrel, cross-bred, and pure breed).

Statistic	Mongrel	Cross bred	Pure breed
Observations	2,406	3,962	24,102
Minimum	0.008	0.003	0.003
1st Quartile	11.006	8.909	9.126
Median	13.569	12.049	11.723
3rd Quartile	15.198	14.350	13.722
Maximum	20.561	21.884	21.539
Mean	12.761	11.225	11.086
Standard deviation	3.762	4.276	3.729
Mean CI (95% upper)	12.838	11.293	11.110
Mean CI (95% lower)	12.684	11.158	11.062