condition mean min max ZT0-3 14.755700000000001 14.57855 14.93285 ZT4-7 13.0588 13.0588 13.0588 ZT8-11 12.682849999999998 12.682849999999998 12.682849999999998 ZT12-15 0 0 0 ZT16-19 21.55315 21.55315 21.55315 ZT20-23 21.860500000000002 21.860500000000002 21.860500000000002