Table 3.

Comparison of non-normalized and normalized FT4 values for different time points and time intervals

Time points/intervals (day)	Non-normalized FT4 (pmol/l) Median [IQR]	Normalized FT4 (pmol/l) Median [IQR]	Significance
Start of treatment ($t_0$ = 0)	7.0 [3.4, 12.3]	5.2 [2.4, 10.4]	N.s.a
0 $<t<$ 50	33.6 [26.3, 45.2]	31.7 [22.6, 43.2]	N.s.a
100 $\le t<$ 150	23.4 [19.5, 26.3]	20.6 [18.0, 24.1]	N.s.a
Last available time point	21.0 [18.4, 25.6]	18.0 [16.0, 22.7]	N.s.a

^aNot significant