condition mean min max ZT0-3 29.562116666666668 27.386049999999997 31.1792 ZT4-7 10.1854 10.1854 10.1854 ZT8-11 34.7004 34.7004 34.7004 ZT12-15 33.6614 31.2162 36.1066 ZT16-19 30.31185 30.31185 30.31185 ZT20-23 31.042900000000003 31.042900000000003 31.042900000000003