condition mean min max ZT0-3 7.381815 7.085649999999999 7.67798 ZT4-7 5.547700000000001 5.547700000000001 5.547700000000001 ZT8-11 5.84524 5.84524 5.84524 ZT12-15 0 0 0 ZT16-19 6.62125 6.62125 6.62125 ZT20-23 7.10163 7.10163 7.10163