Table II.

Multiple linear regression model for the change in disease grade after treatment.

	Study group (n = 94)			Grade IV at onset (n = 68)			Grade V at onset (n = 26)
Variable	Change difference*	95% CI	p	Change difference*	95% CI	p	Change difference*	95% CI	p
Kabat	-0.99	-1.27, -0.71	< 0.001	-0.86	-1.23, -0.49	< 0.001	-1.10	-1.82, -0.38	0.005
10-years increase in age	0.05	-0.03, 0.13	0.206	57.1%	0.01, 0.17	0.029	-0.06	-0.29, 0.16	0.56
Male	-0.02		0.888	64.3%	-0.32, 0.21	0.698	0.08	-0.58, 0.74	0.80

^*Negative values indicate improvement, i.e. decrease in grade * All patients who had an improvement by three grades or more were treated with Kabat.