These differences were somewhat greater in children with TSH 5 mIU/L ( HC : T4 , 50.5 vs placebo , 49.7 cm ; P = .01 ; height : T4 , 133.8 vs placebo , 130.8 cm ; P = .02 ) , but were not found in children with TSH < 5 mIU/L ( HC : T4 , 50.1 vs placebo , 50.0 cm ; P = .75 ; height : T4 , 132.1 vs placebo , 131.6 cm ; P = .22 ) .