condition mean min max ZT0-3 1.3287657499999999 0.7971665 1.8603649999999998 ZT4-7 0.588375 0.588375 0.588375 ZT8-11 0.041478 0.041478 0.041478 ZT12-15 0 0 0 ZT16-19 0.0825134 0.0825134 0.0825134 ZT20-23 0.663781 0.663781 0.663781