condition mean min max ZT0-3 2.6653700000000002 2.45574 2.875 ZT4-7 5.33235 5.33235 5.33235 ZT8-11 5.804399999999999 5.804399999999999 5.804399999999999 ZT12-15 0 0 0 ZT16-19 4.822625 4.822625 4.822625 ZT20-23 4.62927 4.62927 4.62927