condition mean min max ZT0-3 1.772064616 0.7972144179999999 2.746914814 ZT4-7 4.8054901580000005 3.6769862685 5.933994047500001 ZT8-11 12.0771576425 8.789248935 15.36506635 ZT12-15 17.8801497825 17.765839615 17.99445995 ZT16-19 12.967727029999999 12.292195159999999 13.6432589 ZT20-23 15.221237965 14.05307663 16.3893993