Karl Pearson and J. F. Tocher 
175 
(iii) — (viii) Cancer Deathrales for all England and Wales. 
The object of the present illustrations is to ascertain whether there are 
significant differences in the cancer deathrates associated with urban and rural 
conditions. We divide the data into four groups : (a) London, (6) County 
Boroughs other than London, (c) Urban Districts other than County Boroughs, 
(d) Rural Districts. We compare pair and pair these four groups in order to 
ascertain the degree of their significant dift'erences. 
The following data are taken from the Registrar-General's 76th Annual Report 
and are for the year 1913* : 
Populations and Cancer Deaths in Age Groups, 1913. 
Populations 
Age Group 
(a) London 
(6) County 
Boroughs 
(c) Urban 
Districts 
(d) Rural 
Districts 
0—15 
15—25 
25—35 
35—45 
45 — 55 
55—65 
65—75 
75—85 
85 and over 
648,361 
383,601 
362,967 
293,427 
213,635 
131,423 
68,124 
18,830 
2,239 
1,796,847 
1.006,039 
938,541 
766,070 
536,949 
331,209 
166,717 
43,125 
4,493 
1,976,078 
1,126,179 
1,017,991 
836,306 
586,962 
369,840 
200,982 
60,407 
7,361 
1,242,634 
716,323 
580,305 
496,185 
395,443 
276,814 
180,029 
65,453 
9,125 
Cancer Deaths 
0—15 
15—25 
25—35 
35—45 
45—55 
55—65 
65—75 
75—85 
85 and over 
25 
24 
51 
130 
472 
723 
655 
209 
29 
31 
39 
128 
416 
1075 
1700 
1312 
450 
29 
47 
34 
121 
353 
971 
1675 
1607 
576 
73 
34 
27 
65 
185 
503 
1077 
1360 
639 
73 
Populations 
Total deaths 
2,122,607 
2,318 
5,589,990 
5,180 
6,182,106 
5,457 
3,962,311 
3,963 
Crude death- 
rates per 
100,000 
109-21 
92-67 
88-37 
100-02 
How far are these differences in the crude deathrates really significant, when 
allowance is made for age groups ? Above all : what is the numerical measure 
of this significance in the six cases? The following table gives the deathrates 
per 100,000 at each age in the four groups : 
* See pp. 4, 217, 234, 253, and 271. 
