Table 39. Number of sources of outlet in any 5-year period |
No. of Sources |
Sample Population | U. S. Population | ||||
Cases | % of Popula- tion |
Cumu- lated Percent |
Cases per 10,000 |
% Of Popula- tion |
Cumu- lated Percent | |
0 | 263 | 2.2 | 100.0 | 199 | 1.99 | 100.00 |
1 | 2,169 | 18.4 | 97.8 | 2,579 | 25.79 | 98.01 |
2 | 3,834 | 32.4 | 79.4 | 3,314 | 33.14 | 72.22 |
3 | 3,478 | 29.5 | 47.0 | 2,742 | 27.42 | 39.08 |
4 | 1,690 | 14.3 | 17.5 | 974 | 9.74 | 11.66 |
5 | 342 | 2.9 | 3.2 | 179 | 1.79 | 1.92 |
6 | 33 | 0.3 | 0.3 | 13 | 0.13 | 0.13 |
Total | 11,809 | 10,000 | ||||
Mean | 2.45 ± 0.01 | 2.22 | ||||
Median | 2.91 | 2.67 | ||||
Computed for the whole population involved in the present study, |
There are, both theoretically and in actuality, endless possibilities in combining these several sources of outlet and in the extent to which each of them contributes to the total picture (Figure 31).
Figure 31. Diverse examples of combinations of six sources of outlet. Each bar shows a combination of outlets used by one individual |
“Educ. level 0-8 years” grade school “Educ. level 9-12 years” high school “Educ. level 13-16 years” college “Educ. level 17-20 years” postgraduate |