condition mean min max ZT0-3 10.668389999999999 10.668389999999999 10.668389999999999 ZT4-7 8.817055 8.817055 8.817055 ZT8-11 4.8709299999999995 4.8709299999999995 4.8709299999999995 ZT12-15 6.210240000000001 6.210240000000001 6.210240000000001 ZT16-19 9.158175 9.158175 9.158175 ZT20-23 11.6126 11.6126 11.6126