Fig. 2

Characterisation of the subpopulation (n = 17); comparison of traits amongst the intervention and control groups at pre-intervention. Box plots depicting the comparison of the anthropological and physiological traits amongst the intervention and control groups, based on a simple t-test analysis, for (a) Age (b) BMI (c) Concentration of Vitamin D in serum (d) Sperm concentration (e) Percentage of sperm motility and (f) Volume of semen produced.