The 350 children whose scoliosis was measured and who form the basis for this report were unselected cases and represent a fair sample of the general population. One hundred and twenty were Jewish children, but these do not differ in any significant way from the others. There were equal numbers of boys and girls. They ranged in age from 6 to 13 years, with a mean age of 9.4 years (probable error 1.42).
The method of measurement was as follows: An ink dot was placed on the skin over the center of each spinous process. The child stood with feet together and weight equally distributed. A piece of rubber band was then stretched from the center of the seventh cervical to the center of the coccyx. At the level of greatest spinal deviation from straightness an ink dot was placed in the line of the rubber band. The mark over