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Table 4 Comparison of TSH, FT3 and FT4 levels in different sampling time groups [mean (SD)]

From: Analysis of basal serum TSH, FT3, and FT4 levels based on age, sampling time in women with infertility

Sampling time

N

TSH (IU/L)a

FT4 (pmol/L)a

FT3 (pmol/L)b

07:00–08:00

355

2.62 (0.88)#

16.22 (2.00)

4.80 (0.49)

08:00–09:00

1347

2.50 (0.85) #

16.16 (1.83)

4.76 (0.53)

09:00–10:00

1035

2.40 (0.86) #

16.29 (1.91)

4.78 (0.53)

10:00–11:00

455

2.27 (0.86)*

16.26 (1.88)

4.77 (0.51)

11:00–12:00

166

2.19 (0.84)*

16.4 (1.80)

4.82 (0.49)

P

 

< 0.001

0.258

0.300

  1. aANOVA test
  2. bKruskal–Wallis rank sum test
  3. #Indicates a significant differences compared with any other groups
  4. *Indicates significant differences compared with first 3 groups.