Table 4. Comparison of Clinical and Laboratory Characteristics of Permanent and Transient Congenital Hypothyroidism Groups (Quantitative Variables)^a.

Variable	Permanent (n = 105)	Transient (n = 59)	P Value
Age at diagnosis, day	34.70 ± 13.84	41.70 ± 26.27	0.09
Mother’s age at delivery, y	25.89 ± 4.91	24.98 ± 3.69	0.221
Birth weight, gram	3112 ± 698	2917 ± 679	0.085
Venous TSH level at diagnosis	37.19 ± 30.40	22.93 ± 19.07	0.001
TSH during the first year of treatment, mIU/L	6.07 ± 8.10	2.50 ± 2.06	0.001
TSH during the three years of treatment, mIU/L	6.10 ± 6.18	2.92 ± 3.50	< 0.001
TSH 30 days after withdrawal of L-T4 therapy, mIUL	12.9 ± 12.8	3.6 ± 1.5	< 0.001
TSH 90 days after withdrawal of L-T4 therapy, mIU/L	10.1 ± 4.6	3.7 ± 1.3	< 0.001

^aValues are presented as Mean ± SD.