condition mean min max ZT0-3 235.75 235.75 235.75 ZT4-7 98.7 98.7 98.7 ZT8-11 131.1 131.1 131.1 ZT12-15 96.95 96.95 96.95 ZT16-19 169.0 169.0 169.0 ZT20-23 227.55 227.55 227.55