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Table 3 Comparison of data of TSH (mU/L) obtained regarding RI defined by the manufacturer (without segmentation by age), with the results of this study that redefined RI specific for age range

From: Reference interval of thyroid stimulating hormone and free thyroxine in a reference population over 60 years old and in very old subjects (over 80 years): comparison to young subjects

 

Results of TSH below RI (mU/L)

Results of TSH upper RI (mU/L)

Age ranges (y. old)

Defined by the manufacturer

With segmentation by age in this study

Difference*

Defined by the manufacturer

With segmentation by age in this study

Difference*

< 60

0.4%

0.8%

+ 0.4%

1.7%

1.5%

- 0.2%

60 - 79

0.4%

2.1%

+ 1.7%

9.2%

2.7%

- 6.5%

80

0.4%

0.8%

+ 0.4%

14.5%

2.0%

- 12.5%

  1. *Refers to percentage of subjects detected with TSH levels out of reference interval (RI) established by the manufacturer versus those where TSH was obtained in this study and RI was segmented by age.