| Size of family | No. of families investigated under 5 years | No. of families showing deaths | Total no. of deaths | |
|---|---|---|---|---|
| 12 | " | 13 | 9 | 16 |
| 13 | " | 1 | 0 | 0 |
| 14 | " | 2 | 0 | 0 |
| 17 | " | 1 | 1 | 2 |
| — | — | — | ||
| 340 | 91 | 119 |
The addition of the new families (which were not subjected to any different selection than the first 100) has brought down the child mortality rate. For the first 100, it was found to be 7.5%. If in the above table the number of child deaths, 119, be divided by the total number of children represented, 2,259, the child mortality rate for this population is found to be 5.27%, or 53 per thousand.
The smallness of this figure may be seen by comparison with the statistics of the registration area, U. S. Census of 1880, when the child mortality (0-4 years) was 400 per thousand, as calculated by Alexander Graham Bell. A mortality of 53 for the first four years of life is smaller than any district known in the United States, even to-day, can show for the first year of life alone. If any city