condition mean min max ZT0-3 128.867375 128.867375 128.867375 ZT4-7 151.62007 151.62007 151.62007 ZT8-11 192.70898899999997 192.70898899999997 192.70898899999997 ZT12-15 181.3726945 181.3726945 181.3726945 ZT16-19 201.24113 201.24113 201.24113 ZT20-23 135.0845785 135.0845785 135.0845785