Results of the Tests after an Interval of from 10 to 17 Months
| N[16] | Mos. | Weight | Height | Grip |
| | Test 1 | Test 3 | Test 1 | Test 3 | Test 1 | Test 3 |
| 1 | 15 | 50·4 | 63·5 | 46·0 | 49·7 | 13·0 | 18·0 |
| 1C | 15 | 53·5 | 62·8 | 46·4 | 49·7 | 11·0 | 15·0 |
| 2 | 15 | 40·9 | 47·9 | 42·6 | 45·9 | 9·0 | 10·0 |
| 2C | 17 | 52·3 | 65·5 | 45·2 | 49·8 | 10·0 | 15·0 |
| 3 | 16 | 55·0 | 67·5 | 47·0 | 50·2 | 12·8 | 13·0 |
| 3C | 14 | 61·5 | 57·8 | 51·7 | 54·0 | 14·0 | 14·5 |
| 4 | 13 | 51·1 | 60·2 | 47·5 | 50·5 | 9·0 | |
| 4C | 13 | 49·4 | 54·2 | 48·9 | 50·8 | 9·5 | |
| 7 | 14 | 39·9 | 45·8 | 42·9 | 45·6 | 7·0 | 6·0 |
| 7C | 12 | 38·4 | 42·1 | 41·9 | 43·7 | 9·0 | 14·0 |
| 8 | 11 | 60·8 | 69·2 | 50·8 | 52·3 | 10·0 | |
| 8C | 11 | 45·4 | 57·9 | 36·8 | 48·7 | 15·0 | |
| 10 | 11 | 48·9 | 56·7 | 46·1 | 48·6 | 12·5 | 12·0 |
| 10C | 11 | 47·1 | 51·8 | 45·6 | 48·1 | 10·0 | 12·0 |
| 11 | 12 | 47·8 | 55·0 | 45·8 | 49·5 | 11·0 | 11·0 |
| 11C | 12 | 41·6 | 47·0 | 43·6 | 46·8 | 11·5 | 7·5 |
| 12 | 12 | 48·0 | 66·5 | 44·8 | | 14·0 | |
| 12C | 11 | 41·0 | 69·6 | 41·5 | | 6·0 | |
| 13 | 12 | 90·0 | 112·0 | 61·3 | 61·8 | 26·5 | 28·5 |
| 13C | 12 | 74·7 | 88·0 | 56·8 | 60·0 | 22·0 | 27·0 |
| 14 | 12 | 56·0 | 66·0 | 51·0 | 53·3 | 16·0 | 17·0 |
| 14C | 12 | 81·9 | 98·0 | 57·9 | 59·5 | 22·0 | 22·5 |
| 15 | 12 | 57·5 | | 51·1 | | 15·5 | | |
| 15C | 10 | 67·2 | | 50·1 | | 15·0 | | |
| 16 | 12 | 56·0 | 60·3 | 51·6 | 53·5 | 19·0 | 18·5 |
| 16C | 11 | 51·2 | 55·0 | 48·7 | 50·1 | 10·0 | 10·0 |
| 18 | 12 | 58·2 | | 47·3 | | 18·0 | | |
| 18C | 11 | 45·3 | | 46·7 | | 8·0 | | |
| 19 | 12 | 90·0 | 108·0 | 57·7 | 60·5 | 22·0 | 20·0 |
| 19C | 11 | 52·4 | 59·0 | 46·7 | 48·0 | 15·0 | 18·0 |
| 20 | 12 | 44·2 | | 47·2 | | 11·0 | | |
| 20C | 11 | 61·3 | | 49·6 | | 15·0 | | |
| 21 | 12 | 70·7 | 85·5 | 54·1 | | 16·5 | 15.0 | |
| 21C | 10 | 62·4 | 69·2 | 49·6 | | 19·0 | 17·0 | |
| 23 | 12 | 51·7 | | 47·8 | | 11·5 | 15·0 | |
| 23C | 11 | 64·1 | | 51·4 | | 14·5 | 16·0 | |
| 27 | 12 | 43·7 | | 45·4 | | 9·0 | 6·0 | |
| 27C | 11 | 41·0 | | 44·6 | | 0 | 9·0 | |
| 28 | 12 | 71·3 | 78·5 | 54·9 | 56·3 | 23·5 | |
| 28C | 11 | 74·2 | 85·8 | 53·4 | 55·9 | 21·0 | |
| N[16] | Tapping | I.Q. | Healy |
| Test 1 | Test 3 | (1) | (3) | (1) | (3) |
| 1 | 135 | 142 | 82 | 93·0 | -25·0 | 11·0 |
| 1C | 106 | 134 | 80 | 85·0 | -50·0 | 11·0 |
| 2 | 105 | 135 | 107 | 113·0 | 28·5 | 24·5 |
| 2C | 152 | 139 | 91 | 86·0 | 3·0 | 19·5 |
| 3 | 136 | 144 | 94 | 91·0 | 21·5 | 15·5 |
| 3C | 135 | 135 | 82 | 96·0 | 17·0 | 25·5 |
| 4 | 103 | | 96 | 111 | 8·5 | |
| 4C | 109 | | 83 | 102 | 33·0 | |
| 7 | 125 | | 91 | 93 | - 6·0 | 16·0 |
| 7C | 105 | | 95 | 112 | 4·5 | 11·0 |
| 8 | 113 | 128 | 91 | 92·0 | 32·5 | |
| 8C | 131 | 121 | 98 | 111·0 | 4·0 | |
| 10 | 68+ 74 | 145+106 | 110 | 116·0 | -12·0 | 11·0 |
| 10C | 70+ 74 | 148+124 | 104 | 107·0 | 27·0 | 48·5 |
| 11 | 125+ 90 | 120+125 | 103 | 102·0 | - 8·0 | 15·5 |
| 11C | 155+125 | 102+112 | 101 | 95·0 | -29·0 | -20·0 |
| 12 | 98+ 69 | | | 86 | 20·0 | 1·0 |
| 12C | 102 | | 98 | 90 | -10·0 | 41·5 |
| 13 | 160+165 | 176+187 | 70 | 61·0 | 43·0 | 62·5 |
| 13C | 150+109 | 188+174 | 66 | 60·0 | -1·5 | 21·5 |
| 14 | 190+172 | 228+215 | 96 | 102·0 | 12·5 | 77·0 |
| 14C | 175+152 | 165+186 | 140 | 138·0 | - 5·0 | 48·5 |
| 15 | 172+167 | 192+186 | 97 | 97·0 | 7·0 | 19·0 |
| 15C | 140+115 | 145+133 | 78 | 98·0 | 1·0 | 54·5 |
| 16 | 145+131 | | 65 | 74 | 49·0 | 79·0 |
| 16C | 145+ 99 | | 74 | 81 | 30·0 | 45·5 |
| 18 | 133+115 | 126+145 | 98 | 101·0 | -13·5 | 13·5 |
| 18C | 100+ 99 | 108+ 92 | 90 | 92·0 | -32·0 | -35·0 |
| 19 | 168+136 | | 96 | 97 | 57·5 | 60·5 |
| 19C | 100+115 | | 98 | 90 | -22·0 | -15·0 |
| 20 | 105+115 | 122+118 | 106 | 116·0 | | 55·0 |
| 20C | 150+120 | 154+154 | 118 | 140·0 | 30·0 | 48·5 |
| 21 | 152+111 | 154+155 | 64 | 66·0 | 20·0 | 38·0 |
| 21C | 140+136 | 174+150 | 86 | 93·0 | 70·5 | 88·0 |
| 23 | 150+119 | 157+157 | 85 | 80·0 | 49·5 | 62·5 |
| 23C | 122+115 | 141+141 | 81 | 88·0 | 4·0 | 64·0 |
| 27 | 108+ 92 | 114+ 95 | 110 | 112·0 | -25·0 | 25·5 |
| 27C | 115+105 | 101+118 | 72 | 98·0 | 2·0 | 39·5 |
| 28 | 150+148 | 176+168 | 81 | 83·0 | 29·5 | 77·5 |
| 28C | 178+148 | 172+157 | 95 | 94·0 | 64·5 | 83·5 |
any very consistent tendency toward improvement. The question, whether or not the results are affected by the differences in time interval, will be considered later.
In weight, the test group showed an average gain of 11·013 pounds, with a median of 9·1 (Table XV). The average gain of the control group was 9·113 pounds and the median 6·8. The gains in the test group are less variable than those of the control. The average of the gains of the test group in excess of those of the control is 1·9 pounds, and the median is 2·2 pounds; while the unreliability of the difference is ± 1·46 The average, then, is only 1·30 P. E. and the median 1·51 P. E.
If we turn to Table III and compare the results there set forth with the results at the end of the second period, we find the gains of the test group exceed those of the control in the following manner.
TABLE XV
Weight, Second Retests, 15 Pairs
| N[16] | Test Group (A) | Control Group (B) |
| Test 1 | Test 3 | Gain | Test 1 | Test 3 | Gain | A-B |
| 12 | 48 | 66·5 | 18·5 | 69·6 | 28·6 | -10·1 |
| 2 | 40·9 | 47·9 | 7 | 52·3 | 65·5 | 13·2 | -6·2 |
| 14 | 56 | 66 | 10 | 81·9 | 98 | 16·1 | -6·1 |
| 28 | 71·3 | 78·5 | 7·2 | 74·2 | 85·8 | 11·6 | -4·4 |
| 8 | 60·8 | 69·2 | 8·4 | 45·4 | 57·9 | 12·5 | -4·1 |
| 16 | 56 | 60·3 | 3·7 | 51·2 | 55 | 3·8 | -·1 |
| 11 | 47·8 | 55 | 7·2 | 41·6 | 47 | 5·4 | 1·8 |
| 7 | 39·9 | 45·8 | 5·9 | 38·4 | 42·1 | 3·7 | 2·2 |
| 10 | 48·9 | 56·7 | 7·8 | 47·1 | 51·8 | 4·7 | 3·1 |
| 1 | 50·4 | 63·5 | 13·1 | 53·5 | 62·8 | 9·3 | 3·8 |
| 4 | 51·1 | 60·2 | 9·1 | 49·4 | 54·2 | 4·8 | 4·3 |
| 21 | 70·7 | 85·5 | 14·8 | 62·4 | 69·2 | 6·8 | 8 |
| 13 | 90 | 112 | 22 | 74·7 | 88 | 13·3 | 8·7 |
| 19 | 90 | 108 | 18 | 52·4 | 59 | 6·6 | 11·4 |
| 3 | 55 | 67·5 | 12·5 | 61·5 | 57·8 | -3·7 | 16·2 |
| Av. | 58·45 | 69·50 | 11·01 | 55·13 | 63·58 | 9·11 | 1·9 |
| M | | | 9·1 | | | 6·8 | 2·2 |
| 75%ile | | | 13·52 | | | 12·67 | 5·22 |
| 25%ile | | | 7·15 | | | 4·47 | -4·07 |
| Q | | | 3·18 | | | 4·1 | 4·65 |
| P. E. (distribution) | 3·81 | | | 4·19 | 6·1 |
| P. E. (average) | ±1·00 | | | ±1·07 | ±1·46 |
| | | | | | Av. = 1·30 P. E. |
| | | | | | M. = 1·51 P. E. |
| 6 months | 12 months |
| Average of gains in test group in excess of control | 1·37 | 1·90 |
| Median | 1·20 | 2·20 |
| P. E. of difference | ±·48 | ±1·46 |
| Average in terms of P. E. | 2·85 | 1·30 |
| Median in terms of P. E. | 2·80 | 1·51 |