Table 4.

Global life expectancy table for cats (all purebred and mixed breed combined).

Age interval in years (x, x + 1)	P(x) total population	d(x) decease population	m(x)	q(x)	l(x)	L(x)	T(x)	e(x)	95% CI
0–1	325,096	17,200	0.0529	0.0515	100,000	95,876	1,118,000	11.18	11.16–11.20
1–2	231,549	7,321	0.0316	0.0311	94,846	93,370	1,022,123	10.78	10.75–10.80
2–3	185,553	5,467	0.0295	0.0290	91,893	90,559	928,754	10.11	10.09–10.13
3–4	162,631	4,877	0.0300	0.0295	89,225	87,907	838,194	9.39	9.37–9.42
4–5	150,407	4,827	0.0321	0.0316	86,589	85,222	750,287	8.66	8.64–8.69
5–6	138,833	5,423	0.0391	0.0383	83,854	82,248	665,066	7.93	7.91–7.95
6–7	125,243	5,401	0.0431	0.0422	80,641	78,939	582,818	7.23	7.21–7.25
7–8	118,952	6,291	0.0529	0.0515	77,237	75,247	503,878	6.52	6.51–6.54
8–9	112,659	7,735	0.0687	0.0664	73,258	70,826	428,631	5.85	5.83–5.87
9–10	100,971	8,041	0.0796	0.0766	68,395	65,776	357,805	5.23	5.22–5.25
10–11	99,722	11,352	0.1138	0.1077	63,157	59,755	292,029	4.62	4.61–4.64
11–12	84,860	10,704	0.1261	0.1187	56,354	53,011	232,277	4.12	4.11–4.14
12–13	79,909	13,446	0.1683	0.1552	49,668	45,813	179,263	3.61	3.60–3.62
13–14	70,670	14,571	0.2062	0.1869	41,959	38,037	133,449	3.18	3.17–3.19
14–15	60,980	15,636	0.2564	0.2273	34,116	30,239	95,412	2.80	2.78–2.81
15–16	50,674	15,945	0.3147	0.2719	26,362	22,779	65,173	2.47	2.46–2.49
16–17	37,426	13,940	0.3725	0.3140	19,195	16,181	42,394	2.21	2.19–2.22
17+	57,088	28,678	0.5023	0.4015	13,168	26,213	26,213	1.99	1.97–2.01

P(x), total population (survivors plus deceased) at the mid-point of the age interval (x, x + 1); d(x), deceased study population in the age interval (x, x + 1); m(x), central rate of death in the age interval (x, x + 1); q(x), conditional probability of death in the age interval (x, x + 1); l(x), number of a hypothetical population of dogs surviving to the age of x years, calculated from a starting population of 100,000 dogs at birth subject throughout life to the same conditional probability of death as the actual population at each age interval; L(x), number of dog years lived at age x, based on the hypothetical starting population of 100,000 dogs at birth; T(x), number of dog-years lived beyond year x; e(x), life expectancy for dogs in the age interval (x, x + 1); CI, confidence interval.