condition mean min max ZT0-3 8.220825 7.33024 9.33489 ZT4-7 6.580204999999999 6.580204999999999 6.580204999999999 ZT8-11 6.92629 6.92629 6.92629 ZT12-15 11.968325 11.90005 12.0366 ZT16-19 10.082374999999999 10.082374999999999 10.082374999999999 ZT20-23 10.89725 10.89725 10.89725