condition mean min max ZT0-3 10.34679 10.34679 10.34679 ZT4-7 10.430780500000001 10.430780500000001 10.430780500000001 ZT8-11 13.851187 13.851187 13.851187 ZT12-15 12.725690499999999 12.725690499999999 12.725690499999999 ZT16-19 12.4912075 12.4912075 12.4912075 ZT20-23 12.2808475 12.2808475 12.2808475