Additional file 1: Figure S1. of Appraisal of testicular volumes: volumes matching ultrasound values referenced to stages of genital development

Testicular volumes determined by the Prader orchidometer (Goede et al.) [8] and in our subjects by measurements in the scrotum with a centimeter ruler (W2 x L × 0.52). Figure S2. Testicular volumes for different stages of genital development (G), obtained with the formula (w-ss)3 × 88, equivalent to ultrasound W x H x L × 0.71. The boxes show the volumes in ml in the ordinance with the range of ages in the abscissa. Additional file 1: Figure S3. Testicular volumes for different Genital Stages obtained by measurements in the scrotum with a centimeter ruler (W2 x L × 0.52). The boxes show the volumes in ml in the ordinance with the range of ages in the abscissa. (The volumes are similar to those obtained with a Prader orchidometer by Goede et al. (Additional file 1: Figure S1).) Figure S4. A rough drawing of a photograph published in 1971, for determining stages of genital development (G), (testes, scrotum and penis only), without consideration of pubic hair from Van Wieringen JD, Wafelbakker F, Verbrugge HP, et al. Growth Diagrams 1965 Netherlands: Second National Survey on 0–24 Year Olds. Netherlands Institute for Preventative Medicine TNO. Groningen, The Netherlands: Wolters- Noordhoff; 1971. Table S1. Similarity of Our Volumes to those Obtained by US (Normalized Smoothed) Reported by Joustra et al. [22].