condition mean min max ZT0-3 25.786375 24.5176 27.055149999999998 ZT4-7 18.6271 18.6271 18.6271 ZT8-11 40.02575 40.02575 40.02575 ZT12-15 0 0 0 ZT16-19 42.32725 42.32725 42.32725 ZT20-23 28.68215 28.68215 28.68215