Northern Hemisphere | Southern Hemisphere | |||||||
---|---|---|---|---|---|---|---|---|
Seasonal variation | Nadir | Peak | Adjusted R2 | Seasonal variation | Nadir | Peak | Adjusted R2 | |
Body Mass Index (kg/m2)* | 0.26† | July | January | 0.97 | 0.52† | December | June | 0.78 |
Waist circumference (cm) * | 0.57† | July | January | 0.95 | 0.77 | 0.82‡ | ||
Systolic blood pressure (mm Hg)§ | 2.93† | June | December | 0.95 | 3.44† | January | July | 0.98 |
Diastolic blood pressure (mm Hg)§ | 1.42† | June | December | 0.96 | 0.86† | November | May | 0.59 |
Triglycerides (mmol/L)§ | 0.02† | April | October | 0.94 | 0.07† | July | January | 0.87 |
Total cholesterol (mmol/L)§ | 0.10† | June | December | 0.91 | 0.21† | October | April | 0.85 |
HDL cholesterol (mmol/L)§ | 0.01† | August | February | 0.93 | 0.04 | 0.64 | ||
LDL cholesterol (mmol/L)§ | 0.11† | July | January | 0.91 | 0.10 | 0.89‡ | ||
Glycaemia (mmol/L)§ | 0.07† | August | February | 0.98 | 0.17† | October | April | 0.67 |
Data from 21 studies from the Northern Hemisphere and 3 from the Southern Hemisphere. Results are presented as seasonal variation, nadir, peak and adjusted R2 (percentage of variance explained).
*Adjusted for gender, age and smoking.
†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 two studies only.
§Adjusted for gender, age, smoking and Body Mass Index.