condition mean min max ZT0-3 4.040895 3.030115 5.0516749999999995 ZT4-7 2.3665599999999998 2.3665599999999998 2.3665599999999998 ZT8-11 2.109115 2.109115 2.109115 ZT12-15 0 0 0 ZT16-19 2.956005 2.956005 2.956005 ZT20-23 3.402745 3.402745 3.402745