Table 3.

An empirical life table for male hedgehogs. Nomenclature follows Jones [73]: x: the exact age at the start of the interval; n: the length of the interval in person-years (the difference between the values of x in consecutive rows); l_x: the number of individuals entering the interval at age x, with the first entry being the number of individuals in the entire cohort and subsequent entries being the number surviving to each age (x); _nd_x: the number of individuals dying between ages x and x + n; _nq_x: the probability of dying, calculated as _nd_x/l_x; _np_x: the probability of surviving, calculated as 1 − (_nd_x/lx);_nL_x: person-years lived between ages x and x + n; T_x: person-years lived above age x; e_x: life expectancy from age x; _nm_x: death rate in the cohort between ages x and x + n; _na_x: the average number of years lived in the time interval by those dying in the time interval, was assumed to be 0.5 throughout.

x	lx	ndx	nqx	npx	nLx	Tx	ex	nmx	nax
0	177	43	0.243	0.757	155.5	460.5	2.602	0.277	0.5
1	134	54	0.403	0.597	107.0	305.0	2.276	0.505	0.5
2	80	23	0.287	0.713	68.5	198.0	2.475	0.336	0.5
3	57	29	0.509	0.491	42.5	129.5	2.272	0.682	0.5
4	28	6	0.214	0.786	25.0	87.0	3.107	0.240	0.5
5	22	7	0.318	0.682	18.5	62.0	2.818	0.378	0.5
6	15	8	0.533	0.467	11.0	43.5	2.900	0.727	0.5
7	7	0	0.000	1.000	7.0	32.5	4.643	0.000	0.5
8	7	0	0.000	1.000	7.0	25.5	3.643	0.000	0.5
9	7	2	0.286	0.714	6.0	18.5	2.643	0.333	0.5
10	5	2	0.400	0.600	4.0	12.5	2.500	0.500	0.5
11	3	1	0.333	0.667	2.5	8.5	2.833	0.400	0.5
12	2	0	0.000	1.000	2.0	6.0	3.000	0.000	0.5
13	2	1	0.500	0.500	1.5	4.0	2.000	0.667	0.5
14	1	0	0.000	1.000	1.0	2.5	2.500	0.000	0.5
15	1	0	0.000	1.000	1.0	1.5	1.500	0.000	0.5
16	1	1	1.000	0.000	0.5	0.5	0.500	2.000	0.5
17	0	0	-	-	-	0.0	-	-	0.5