condition mean min max ZT0-3 657.65 657.65 657.65 ZT4-7 455.5 455.5 455.5 ZT8-11 490.34999999999997 490.34999999999997 490.34999999999997 ZT12-15 517.5 517.5 517.5 ZT16-19 501.75 501.75 501.75 ZT20-23 621.55 621.55 621.55