condition mean min max ZT0-3 4.54481 4.54481 4.54481 ZT4-7 3.1043950000000002 3.1043950000000002 3.1043950000000002 ZT8-11 3.74066 3.74066 3.74066 ZT12-15 2.9399550000000003 2.9399550000000003 2.9399550000000003 ZT16-19 3.69353 3.69353 3.69353 ZT20-23 3.8449549999999997 3.8449549999999997 3.8449549999999997