Table 4.

Model fits of I-131 thyroid dose response analyses for all subjects and females only.

Modela population	f(d)	df	test for significance change in deviance	P	AIC
Null					902.63
combined	βd	1	0.49	0.48	904.13
	βlog(d)	1	0.02	0.90	904.61
	βd exp(−γd)	2	1.40	0.50	905.22
	Dichotomousb	2	2.47	0.29	904.16
female	βd	1	1.02	0.31	903.61
	βlog(d)	1	1.88	0.17	902.74
	βd exp(−γd)	2	2.21	0.33	904.41
	Dichotomous	2	4.08	0.13	902.55

^aAll analyses performed with adjustment for gender, age at examination by gender, place of residency, period of examination, ATPO level, thyroid volume and ultrasound-detected nodules.

^bWith estimated threshold