TABLE XXIII
Average Interval Before Filing Petition, After Arrival, at Ages of Fifteen to Twenty, by Races
| Country of Birth | Number in Age Group 15–20 | Average Interval (Years) |
| All countries | 9,512 | 11.0{1} |
| France | 10 | 17.7 |
| Canada | 99 | 17.3 |
| Switzerland | 50 | 15.6 |
| Germany | 600 | 14.1 |
| England | 216 | 13.6 |
| Sweden | 269 | 12.7 |
| Scotland | 57 | 12.7 |
| Denmark | 65 | 12.2 |
| Holland | 32 | 12.2 |
| Finland | 54 | 11.7 |
| Ireland | 609 | 11.5 |
| Norway | 148 | 11.3 |
| Italy | 1,198 | 10.8 |
| Hungary | 960 | 10.8 |
| Austria | 1,658 | 10.6 |
| Rumania | 202 | 10.2 |
| Russia | 3,055 | 9.9 |
| Greece | 47 | 9.7 |
| Turkey in Asia | 69 | 9.0 |
| Turkey in Europe | 42 | 7.9 |
note 1: This average includes the figures for races whose numbers are too small to justify generalization.
The striking thing in these tables is the fact that almost without exception the countries showing the longest intervals are those representing the old immigration.
TABLE XXIV
Average Interval Before Filing Petition, After Arrival, at Ages Twenty-one or Over, by Races
| Country of Birth | Number in Age Group 21 Years and Over | Average Interval (Years) |
| All countries | 13,849 | 10.6{1} |
| Canada | 198 | 16.4 |
| Sweden | 316 | 13.1 |
| Switzerland | 140 | 12.2 |
| France | 57 | 11.9 |
| Germany | 1,425 | 11.9 |
| England | 538 | 11.7 |
| Italy | 1,742 | 11.4 |
| Norway | 228 | 10.8 |
| Scotland | 218 | 10.6 |
| Finland | 84 | 10.5 |
| Austria | 1,828 | 10.5 |
| Denmark | 122 | 10.2 |
| Holland | 90 | 10.1 |
| Hungary | 1,291 | 9.9 |
| Rumania | 278 | 9.8 |
| Russia | 3,936 | 9.6 |
| Ireland | 1,087 | 9.6 |
| Greece | 31 | 8.6 |
| Turkey in Asia | 63 | 8.5 |
| Turkey in Europe | 42 | 8.1 |