condition mean min max ZT0-3 440.54999999999995 440.54999999999995 440.54999999999995 ZT4-7 816.5 816.5 816.5 ZT8-11 767.5 767.5 767.5 ZT12-15 661.55 661.55 661.55 ZT16-19 518.65 518.65 518.65 ZT20-23 458.1 458.1 458.1