title: Association of thyroid-stimulating hormone with lipid concentrations: an 11-year longitudinal study.
abstract: BACKGROUND
  Scant data exist on the longitudinal association between thyroid function and lipid concentrations. We investigated associations of TSH and lipid concentrations cross-sectionally and longitudinally in a nationwide population sample.
  
  
  METHODS
  A total of 5205 randomly sampled participants representative of Finns aged ≥30 years were examined in 2000-2001 and included in cross-sectional analyses. A total of 2486 were re-examined 11 years later and included in longitudinal analyses. With linear regression models adjusted for age, gender, smoking and body mass index, we assessed the associations of baseline TSH and TSH categories (low, reference range and high) with total, high-density lipoprotein (HDL) and low-density lipoprotein (LDL) cholesterol; apolipoprotein A1 and B; and triglycerides at baseline and follow-up.
  
  
  RESULTS
  At baseline, higher TSH associated with higher total cholesterol (β = 0·025, standard error [SE] = 0·007, P < 0·001), LDL cholesterol (β = 0·020, SE = 0·007, P = 0·002), apolipoprotein B (β = 0·006, SE = 0·002, P < 0·001) and log triglycerides (β = 0·008, SE = 0·003, P = 0·004), but not with other lipid outcomes. Higher baseline TSH associated with higher total cholesterol (β = 0·056, SE = 0·026, P = 0·033), LDL cholesterol (β = 0·057, SE = 0·023, P = 0·015) and apolipoprotein B (β = 0·012, SE = 0·006, P = 0·028) at follow-up in women, but not with any lipid outcomes in men. Participants with high TSH at baseline had a 0·22 mmol/l (95% confidence interval 0·02-0·41 mmol/l) higher LDL cholesterol at follow-up (P = 0·028) than participants with TSH in the reference range (0·4-3·4 mU/l). However, exclusion of participants with high-risk baseline lipid values rendered these positive longitudinal associations nonsignificant (P ≥ 0·098).
  
  
  CONCLUSIONS
  We could confirm a modest association between higher TSH and an adverse lipid profile cross-sectionally but not indisputably longitudinally.
authors.affiliation: Department of Health, National Institute for Health and Welfare, Helsinki, Finland.|Heart Centre, Turku University Hospital, Turku, Finland.
authors.forename: Ville L
authors.initials: VL
authors.lastname: Langén
authors.affiliation: Department of Health, National Institute for Health and Welfare, Helsinki, Finland.|The Framingham Heart Study, Framingham, MA, USA.
authors.forename: Teemu J
authors.initials: TJ
authors.lastname: Niiranen
authors.affiliation: Department of Health, National Institute for Health and Welfare, Helsinki, Finland.
authors.forename: Pauli
authors.initials: P
authors.lastname: Puukka
authors.affiliation: Department of Health, National Institute for Health and Welfare, Helsinki, Finland.
authors.forename: Jouko
authors.initials: J
authors.lastname: Sundvall
authors.affiliation: Department of Health, National Institute for Health and Welfare, Helsinki, Finland.
authors.forename: Antti M
authors.initials: AM
authors.lastname: Jula
mesh_terms: D000328:Adult; D000368:Aged; D003430:Cross-Sectional Studies; D005260:Female; D006801:Humans; D050356:Lipid Metabolism; D008074:Lipoproteins / Q000097:blood*; D008137:Longitudinal Studies; D008297:Male; D008875:Middle Aged; D012044:Regression Analysis; D013972:Thyrotropin / Q000097:blood*
chemical_list: D008074:Lipoproteins; D013972:Thyrotropin