condition mean min max ZT0-3 2927.1000000000004 2927.1000000000004 2927.1000000000004 ZT4-7 3665.8 3665.8 3665.8 ZT8-11 3745.8500000000004 3745.8500000000004 3745.8500000000004 ZT12-15 3914.2 3914.2 3914.2 ZT16-19 3447.25 3447.25 3447.25 ZT20-23 3156.75 3156.75 3156.75