Table 3. Final diagnosis of permanent (PCH) or transient (TCH) in according to the decreasing concentrations of serum free T4 (ng/dL).

Final diagnosis		0.79 to 1.16	0.4 to 0.78	<0.4	Total
PHC	n (%)	30 (45.4)	18 (27.3)	18 (27.3)	66 (100)
THC	n (%)	87 (87.9)	10 (10.1)	2 (2.0)	99 (100)

Values expressed as n (%), P < 0.0001, Fisher's exact test.