condition mean min max ZT0-3 1.5683224999999998 1.50142 1.635225 ZT4-7 1.066543 1.066543 1.066543 ZT8-11 1.543545 1.543545 1.543545 ZT12-15 0 0 0 ZT16-19 2.565245 2.565245 2.565245 ZT20-23 1.9907749999999997 1.9907749999999997 1.9907749999999997