Case number
x1: age, years
x2: Body weight, lb
x3: Height, in
x4: neck circumference, cm
x5: chest circumference, cm
x6: ab circumference, cm
x7: hip circumference, cm
x8: thigh circumference, cm
x9: knee circumference, cm
x10: ankle circumference, cm
x11: biceps circumference, cm
x12: forearm circumference, cm
x13: wrist circumference, cm
y: percentage body fat