condition mean min max ZT0-3 8.077359999999999 8.077359999999999 8.077359999999999 ZT4-7 5.351615 5.351615 5.351615 ZT8-11 4.85844 4.85844 4.85844 ZT12-15 44.571749999999994 44.571749999999994 44.571749999999994 ZT16-19 41.7124 41.7124 41.7124 ZT20-23 21.268549999999998 21.268549999999998 21.268549999999998