condition mean min max ZT0-3 24.5191 22.860950000000003 26.0248 ZT4-7 22.2284 22.2284 22.2284 ZT8-11 21.642899999999997 21.642899999999997 21.642899999999997 ZT12-15 30.542875000000002 28.681150000000002 32.4046 ZT16-19 25.89015 25.89015 25.89015 ZT20-23 33.0513 33.0513 33.0513