condition mean min max ZT0-3 87.03103333333333 66.10535 107.49799999999999 ZT4-7 47.975049999999996 47.975049999999996 47.975049999999996 ZT8-11 48.55815 48.55815 48.55815 ZT12-15 72.83857499999999 71.7663 73.91085 ZT16-19 82.8628 82.8628 82.8628 ZT20-23 116.2425 116.2425 116.2425