condition mean min max ZT0-3 1.705795 1.629495 1.782095 ZT4-7 1.9129399999999999 1.9129399999999999 1.9129399999999999 ZT8-11 1.719175 1.719175 1.719175 ZT12-15 0 0 0 ZT16-19 3.630835 3.630835 3.630835 ZT20-23 2.64018 2.64018 2.64018