Table 2

Seasonal variation estimates of lipids and glycaemia, restricted to studies that collected fasting blood samples

 Northern HemisphereSouthern Hemisphere
Seasonal variationNadirPeakAdjusted R2 Seasonal variationNadirPeakAdjusted R2
Triglycerides (mmol/L)0.03*AprilOctober0.920.09*JulyJanuary0.54
Total cholesterol (mmol/L)0.13*JuneDecember0.890.070.64
HDL cholesterol (mmol/L)0.02*JuneDecember0.850.08*JuneDecember0.46
LDL cholesterol (mmol/L)0.12*JulyJanuary0.920.220.08†
Glycaemia (mmol/L)0.08*JuneDecember0.970.020.50
  • Data from 14 studies from the Northern Hemisphere and 2 from the Southern Hemisphere. Data adjusted for gender, age, smoking, body mass index and hypolipidemic (for lipids) or antidiabetic (for glycaemia) drug treatment. Results are presented as seasonal variation, nadir, peak and adjusted R2 (percentage of variance explained).

  • *Seasonal variation statistically significant at 5% level, that is, at least one of the associated p values of sine or cosine functions <0.05.

  • †Data were available for one study only.