condition mean min max ZT0-3 255.75 255.75 255.75 ZT4-7 206.5 206.5 206.5 ZT8-11 227.8 227.8 227.8 ZT12-15 228.3 228.3 228.3 ZT16-19 317.79999999999995 317.79999999999995 317.79999999999995 ZT20-23 332.35 332.35 332.35