condition mean min max ZT0-3 2.207062 1.4544540000000001 2.95967 ZT4-7 0.3658975 0.3658975 0.3658975 ZT8-11 2.34071 2.34071 2.34071 ZT12-15 0 0 0 ZT16-19 5.46114 5.46114 5.46114 ZT20-23 3.0841325 3.0841325 3.0841325