condition mean min max ZT0-3 250.25525 234.61950000000002 265.89099999999996 ZT4-7 200.22899999999998 200.22899999999998 200.22899999999998 ZT8-11 170.8155 170.8155 170.8155 ZT12-15 0 0 0 ZT16-19 206.80849999999998 206.80849999999998 206.80849999999998 ZT20-23 267.3715 267.3715 267.3715