condition mean min max ZT0-3 139.51283333333333 137.8965 140.801 ZT4-7 127.9365 127.9365 127.9365 ZT8-11 116.012 116.012 116.012 ZT12-15 115.06625 104.363 125.7695 ZT16-19 126.17750000000001 126.17750000000001 126.17750000000001 ZT20-23 126.444 126.444 126.444