Fig. 2
Testicular volumes ((W-ss)3 × 0.64) for stages of genital development (G), equivalent to ultrasound W x H x L × 0.52. The boxes for the testicular volumes of each stage of genital development and adults were determined as indicated in the methods. The width of the testis in the scrotum was measured with a centimeter ruler. The stages of genital development and range of ages were identified and the volumes were calculated by the formula (W-ss)3 × 0.64. The minimal and maximal values observed (not standard deviations) in ml were plotted in the ordinance and the range of ages in the abscissa. The boxes and the figure will be the same for volumes calculated with formula (W-ss)3 × 0.88 or equation W2x L × 0.52 (in Additional file 1: Figure S2 & Figure S3) but with different numbers for the minimal and maximal volumes