condition mean min max ZT0-3 6.4207775 5.909345 6.9322099999999995 ZT4-7 4.0207749999999995 4.0207749999999995 4.0207749999999995 ZT8-11 8.39218 8.39218 8.39218 ZT12-15 0 0 0 ZT16-19 10.037855 10.037855 10.037855 ZT20-23 7.45715 7.45715 7.45715