condition mean min max ZT0-3 12.584641666666666 5.7524 17.6002 ZT4-7 0.0 0.0 0.0 ZT8-11 8.733765 8.733765 8.733765 ZT12-15 11.2897575 8.79497 13.784545000000001 ZT16-19 0.6354075 0.6354075 0.6354075 ZT20-23 12.387294999999998 12.387294999999998 12.387294999999998