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Table 3 Comparison of TSH, FT3 and FT4 levels in different age groups [mean (SD)]

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

Age

N

TSH (IU/L)a

FT4 (pmol/L)a

FT3 (pmol/L)b

≤ 25

355

2.45 (0.88) #

16.45 (1.95)

5.03 (0.49) #

26–30

1347

2.43 (0.87)

16.37 (1.90)

4.84 (0.52) #

31–35

1035

2.36 (0.86)

16.21 (1.83)

4.71 (0.50) #

36–40

455

2.28 (0.83)

16.07 (1.85)*

4.66 (0.51) #

> 40

166

2.38 (0.89)

15.69 (1.79) #

4.56 (0.43) #

P

 

0.017

< 0.001

< 0.001

  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
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