After @ months of treatment , both groups had a significantly increased bone age , but the letrozole group had a significantly slowed increase in bone age compared with the control group ( @ @ years vs @ @ years ; P < @ ) ; compared with the control group , the letrozole group had a significantly increased predicted adult height SD score ( -@ @ vs -@ @ ; P < @ ) and a significantly increased T level ( @ @ nmol/L vs @ @ nmol/L ; P < @ ) .