condition mean min max ZT0-3 56.71098333333333 36.7799 69.5421 ZT4-7 44.9771 44.9771 44.9771 ZT8-11 9.944445 9.944445 9.944445 ZT12-15 17.316000000000003 11.5012 23.1308 ZT16-19 37.334900000000005 37.334900000000005 37.334900000000005 ZT20-23 51.9548 51.9548 51.9548