A two and a half-year prospective study was carried out to determine
incidence rates and distributions of various parameters associated with
idiopathic scoliosis. Data were also collected on the progression curves
detected at the initial screening. The results showed: (1) that the
incidence rate was 13.6 per cent with a female-to-male ratio of 1.2:1, (2)
that the most common type of curve was thoracolumbar, and (3) that
spontaneous improvement occurred in approximately 22 per cent of those
patients followed for an average of one year.