Showing improvement in various tests of operative group over and above such improvement in control group. Expressed in Terms of P. E.
| Weight | Height | Height-Weight | Grip | Tapping | Tapping fatigue | I.Q. | Healy | |
| P. E. | P. E. | P. E. | P. E. | P. E. | P. E. | P. E. | P. E. | |
| Average | 2·85 | 1·00 | 2·02 | -·50 | ·03 | -·50 | -·94 | -1·92 |
| Median | 2·80 | 1·25 | ·55 | -·83 | ·32 | -·50 | 0.00 | -2·54 |
CHAPTER IV
MEASUREMENT OF IMPROVEMENT AFTER A SECOND INTERVAL OF SIX MONTHS
In view of the fact that one of the experimenters[15] found improvement in school work when her study was extended to cover a second time interval after operation, it was deemed advisable to similarly extend the present investigation in order to determine whether our operated cases showed any improvement after twelve months. To this end, the fifty-six children composing the final groups of the first study, were sought after a second interval of about six months. Conditions made it impossible to give all the retests exactly twelve months from the time of the operation. As a matter of fact, the period ranges from ten to seventeen months. An effort was made to keep the interval between tests equal for the two members of a given pair.
The same tests were given as in the first study. About half of the testing was done by one of the former examiners, but she was obliged to turn the work over to another before it had been completed. The second examiner was highly recommended, and had had training and practical experience in the giving of tests. She was instructed in the methods which had been employed previously, so that conditions were as far as possible kept constant.
The results of the tests are collected in Table XIV. In the first column is given the length of the time interval for each case. It may be seen that the final group was composed of forty-two children, forming twenty-one pairs. There were fifteen pairs which received a second rating in weight; thirteen in height; thirteen in grip; fifteen in tapping, eleven in fatigue as shown by tapping, twenty-one in I.Q., and eighteen in the Healy Test. These numbers while they are smaller than we could wish, would seem to be great enough to indicate