Hints from the Health Department. Leaflet from the archive of the Society of Medical Officers of Health. Credit: Wellcome Collection, London
[Report of the Medical Officer of Health for London County Council]
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Table "D" shows numbers who have educational levels above, up to, or below their chronological ages—-the latter shown in years of retardation (695 cases).
| Chronological age in years. | Testing above chronological age. | Testing up to chronological age. | One year retarded. | 2 years retarded. | 3 years retarded | 4 years retarded. | 5 years retarded. | 6 years retarded. | 7 years retarded. | 8 years retarded. | 9 years retarded. |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 4 | — | 2 | — | _ | _ | _ | - | _ | — | _ | _ |
| 5 | — | 1 | 5 | — | — | — | - | — | — | — | — |
| 6 | — | 1 | 3 | 2 | - | - | - | - | - | — | - |
| 7 | — | — | 5 | 5 | 2 | — | — | — | — | - | — |
| 8 | 1 | 3 | 7 | 7 | 2 | i | — | — | — | - | — |
| 9 | — | 8 | 10 | 11 | 9 | 9 | i | — | — | - | _ |
| 10 | 1 | 7 | 15 | 17 | 9 | 5 | 4 | _ | _ | _ | - |
| 11 | 1 | 9 | 10 | 17 | 10 | 11 | 8 | 4 | __ | _ | - |
| 12 | 4 | 2 | 9 | 8 | 18 | 12 | 13 | 1 | 6 | - | |
| 13 | 2 | 10 | 7 | 10 | 25 | 21 | 14 | 13 | 5 | 2 | 1 |
| 14 | 4 | 8 | 10 | 16 | 17 | 15 | 7 | 7 | 4 | 2 | 1 |
| 15 | — | 9 | 20 | 24 | 35 | 30 | 34 | 16 | 11 | 10 | 4 |
| Totals | 13 | 60 | 101 | 117 | 132 | 104 | 81 | 41 | 26 | 14 | 6 |
| Per cent. | 10.5 | 14.5 | 16.8 | 18.8 | 14.8 | 13.1 | 5.5 | 3.5 | 2.0 | 0.5 | |
Table " E " shows numbers whose practical ability as estimated by Porteus Maze test is above, up to, or below their chronological ages—the latter expressed as years of retardation (668 cases).
| Chronological age in years. | Testing above chronological age. | Testing up to chronological age. | One year retarded. | 2 years retarded | 3 years retarded. | 4 years retarded. | 5 years retarded. | 6 years retarded. | 7 years retarded. | 8 years retarded. | 9 years retarded. |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 4 | _ | 1 | - | - | - | - | - | - | - | - | - |
| 5 | - | - | - | - | - | - | - | - | - | - | - |
| 6 | 3 | 1 | — | 1 | - | - | - | - | - | - | - |
| 7 | 1 | 4 | 2 | 2 | - | - | - | - | - | - | - |
| 8 | 5 | 7 | 6 | 4 | 1 | - | - | - | - | - | - |
| 9 | 3 | 6 | 18 | 17 | 3 | 1 | - | - | - | - | - |
| 10 | 2 | 10 | 15 | 16 | 12 | 2 | - | - | — | — | - |
| 11 | 2 | 5 | 7 | 19 | 19 | 11 | 4 | 1 | 1 | — | — |
| 12 | 1 | 5 | 3 | 13 | 21 | 9 | 13 | 3 | 2 | 2 | — |
| 13 | — | 1 | 3 | 15 | 37 | 20 | 18 | 11 | 2 | — | 1 |
| 14 | — | — | 2 | 5 | 14 | 20 | 19 | 16 | 7 | 3 | 1 |
| 15 | — | 2 | 7 | 19 | 38 | 49 | 42 | 18 | 7 | 4 | 1 |
| Totals | 17 | 42 | 63 | 111 | 146 | 113 | 96 | 49 | 19 | 9 | 3 |
| Per cent. ... | V 8.8 | 9.5 | 16.6 | 21.8 | 16.9 | 14.4 | 7.4 | 2.8 | 1.4 | 0.4 | |
Table " F " compares the percentages of ch1ldren whose mental, educat1onal and Porteus levels are above, and up to, or below their chronological ages. Totals examined—695 mental levels; 695 educational levels; 668 Porteus levels.
| Up to or above chronological age) | 1 year retarded. | 2 years retarded. | 3 years retarded. | 4 years retarded. | 5 years retarded. | 6 years retarded. | 7 years retarded. | 8 years retarded. | 9 years retarded. | |
|---|---|---|---|---|---|---|---|---|---|---|
| Mental levels | 26.2 | 20.8 | 18.4 | 17.2 | 9.4 | 4.0 | 1.9 | 1.6 | 0.35 | 0.15 |
| Educational levels | 10.5 | 14.5 | 16.8 | 18.8 | 14.8 | 131 | 5.5 | 3.5 | 20 | 0.5 |
| Porteus levels | 8.8 | 9.5 | 16.6 | 21.8 | 16.9 | 14.4 | 7.4 | 2.8 | 1.4 | 0.4 |
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