condition mean min max ZT0-3 57.950006 57.950006 57.950006 ZT4-7 74.59297649999999 74.59297649999999 74.59297649999999 ZT8-11 64.6298985 64.6298985 64.6298985 ZT12-15 56.539085 56.539085 56.539085 ZT16-19 71.4366225 71.4366225 71.4366225 ZT20-23 68.8908455 68.8908455 68.8908455