Changes in Serum TSH and T4 Levels after Switching the Levothyroxine Administration Time from before Breakfast to before Dinner

Table 3

Changes to the serum levels of T4 during the study (all data are reported as mean ± SD).

Age group	Serum T4 (μg/dL)
	BB^1	BD^2	Difference	value
≤40 years ()	8.87 ± 2.62	8.42 ± 1.25	0.45 ± 1.37	0.4
>40 years ()	9.20 ± 1.62	9.05 ± 1.25	0.15 ± 0.37	0.7
Total population ()	8.98 ± 2.32	8.63 ± 1.27	0.35 ± 1.05	0.3

Before breakfast, ²before dinner.