condition mean min max ZT0-3 3.7633900000000002 3.7633900000000002 3.7633900000000002 ZT4-7 2.94728 2.94728 2.94728 ZT8-11 2.92384 2.92384 2.92384 ZT12-15 3.94687 3.94687 3.94687 ZT16-19 3.57704 3.57704 3.57704 ZT20-23 2.73527 2.73527 2.73527