condition mean min max ZT0-3 1.9262199999999998 1.66749 2.1849499999999997 ZT4-7 1.4138700000000002 1.4138700000000002 1.4138700000000002 ZT8-11 3.25481 3.25481 3.25481 ZT12-15 0 0 0 ZT16-19 4.918245 4.918245 4.918245 ZT20-23 2.831295 2.831295 2.831295