Hygiene and public health / by Louis C. Parkes.

  • Parkes, Louis Coltman, 1857-1942.
Date:
1895
Catalogue details

Licence: Public Domain Mark

Credit: Hygiene and public health / by Louis C. Parkes. Source: Wellcome Collection.

    531/578 (page 507)
    the mean duration of life (mean after-lifetime or ex- pectation of life at birth). It is not the same thing as Xh^ probable duration of life, which is the age at which a given number of children born at the same time are reduced one-half. The mean duration of life for males (English Life-Table, 1871-80) was 4i'35 years, whilst the probable duration of life was about 47^ years. Eniylisli Life-Table, 1871-80 (abridged from Dr. Ogle's). Mai.ks. Females. Age. Of a million born Mean after- Of a million born Mean after- number surviving. lifetime. number surviving. lifetime. 0 T,000,000 4i'35 1,000,000 44-62 I 841,417 48-05 871,266 50-14 2 790,201 50-14 820,480 52-22 3 763,737 50-86 793,359 52-99 4 746,5^7 51-01 775,427 53-20 5 734,068 50-87 762,622 53-08 10 708,990 47-60 738,382 49-76 15 696,419 43-41 724,950 45-63 20 680,033 39-40 707,949 41-66 25 657,077 35-68 684,858 37-98 30 630,038 32-10 658,418 34-41 35 598,860 28-64 628,842 30-90 40 563,077 25-30 596,113 27-46 45 522,374 22-07 560,174 24-06 50 476,980 18-93 520,901 20-68 55 424,677 15-95 477,440 17-33 60 365,011 13-14 422,835 14-24 65 297,156 10-56 355,165 11-42 70 222,056 8-27 277,225 8-95 Mean after-lifetime is a more accurate expression than expectation of life, as, strictly speaking, the time which it is expected a person will live is the time which it is an even chance he will live ; it is then strictly the probable duration of his life. It has been thought advisable to * Supplement to the 45th Annual Report of Registrar-General.