9-folds by Parrillo for Males is a bodyfat calculation based on 9-folds by Parillo formula. All skinfold measurements should be made on the right side of the body in mm using a body fat caliper. Body fat caliper should be placed 1 cm away from thumb and finger,perpendicular to skinfold,and halfway between crest and base of fold. Pinch should be maintained with the body fat caliper for 1 to 2 seconds before reading the caliper. Take duplicate measurements at each site,allow time for skin to regain normal texture and thickness.
J. Parrillo,Greenwood-Robinson. "High-performance bodybuilding." Berkeley Publishing group,New York,169-172,1993.