condition mean min max ZT0-3 59.38271666666667 52.704899999999995 63.38805000000001 ZT4-7 58.2408 58.2408 58.2408 ZT8-11 39.268950000000004 39.268950000000004 39.268950000000004 ZT12-15 35.602475 28.96885 42.2361 ZT16-19 81.76915 81.76915 81.76915 ZT20-23 86.1713 86.1713 86.1713