condition mean min max ZT0-3 9.100656666666668 2.06197 14.23395 ZT4-7 2.046075 2.046075 2.046075 ZT8-11 2.978625 2.978625 2.978625 ZT12-15 4.88274 3.4163 6.3491800000000005 ZT16-19 7.236725 7.236725 7.236725 ZT20-23 12.764800000000001 12.764800000000001 12.764800000000001