High-normal TSH levels tied to all-cause mortality

Nelson Vergel

Founder, ExcelMale.com
Kosuke Inoue, MD, of the Endocrinology and Diabetes Center, Yokohama Rosai Hospital in Japan, and colleagues evaluated data from National Health and Nutrition Examination Survey III (1988-1994) on 12,584 adults (mean age, 45.4 years; 48.6% men) in the United States to determine the relationship between low-normal thyroid function and all-cause or cause-specific mortalities. Follow-up was conducted for a median of 19.1 years.

Participants were divided into groups based on their TSH concentrations: 0.39 mIU/L to 1.15 mIU/L (low-normal TSH group), 1.16 mIU/L to 1.89 mIU/L (medium-normal TSH group) and 1.9 mIU/L to 4.6 mIU/L (high-normal TSH group).

Through follow-up, there were 3,395 all-cause deaths, including 1,048 CV deaths, 730 cancer deaths and 1,617 deaths from other causes.

Compared with the medium-normal TSH group, the high-normal TSH group (HR = 1.27; 95% CI, 1.1-1.47) and the low-normal TSH group (HR = 1.17; 95% CI, 1.02-1.35) had increased risk for all-cause death. The high-normal TSH group had a higher risk for CV death (HR = 1.3; 95% CI, 1.02-1.67) or cancer death (HR = 1.43; 95% CI, 1.01-2.01) compared with the other two groups.

The risk for all-cause mortality was significantly higher for men in the high-normal TSH group (HR = 1.29; 95% CI, 1.06-1.58) and men in the low-normal TSH group (HR = 1.32; 95% CI, 1.08-1.61) compared with men in the medium-normal TSH group. The risk for all-cause mortality was higher among women in the high-normal TSH group compared with women in the other two groups (HR = 1.24; 95% CI, 1.05-1.46).

In participants younger than 60 years, the risk for all-cause mortality was higher in the high-normal TSH group (HR = 1.49; 95% CI, 1.19-1.86) and the low-normal TSH group (HR = 1.29; 95% CI, 1.03-1.6) compared with the medium-normal TSH group. The high-normal TSH group had a higher prevalence of metabolic syndrome compared with the medium-normal TSH group (OR = 1.22; 95% CI, 0.96-1.55).

http://www.healio.com/endocrinology...normal-tsh-levels-tied-to-all-cause-mortality
 

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A form of estrogen produced from testosterone. Important for bone health, mood, and libido. Too high can cause side effects; too low can affect well-being.

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Scientific Reference

Lakshman KM, Kaplan B, Travison TG, Basaria S, Knapp PE, Singh AB, LaValley MP, Mazer NA, Bhasin S. The effects of injected testosterone dose and age on the conversion of testosterone to estradiol and dihydrotestosterone in young and older men. J Clin Endocrinol Metab. 2010 Aug;95(8):3955-64.

DOI: 10.1210/jc.2010-0102 | PMID: 20534765 | PMCID: PMC2913038

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