condition mean min max ZT0-3 25.832733333333337 19.4203 34.152150000000006 ZT4-7 12.54405 12.54405 12.54405 ZT8-11 20.9105 20.9105 20.9105 ZT12-15 36.980925 36.89005 37.071799999999996 ZT16-19 53.157849999999996 53.157849999999996 53.157849999999996 ZT20-23 47.592 47.592 47.592