condition mean min max ZT0-3 27.692975 25.7183 29.667650000000002 ZT4-7 19.632649999999998 19.632649999999998 19.632649999999998 ZT8-11 62.175000000000004 62.175000000000004 62.175000000000004 ZT12-15 0 0 0 ZT16-19 62.37505 62.37505 62.37505 ZT20-23 43.3133 43.3133 43.3133