condition mean min max ZT0-3 1236.7533333333333 1028.245 1468.78 ZT4-7 1336.38 1336.38 1336.38 ZT8-11 1204.0300000000002 1204.0300000000002 1204.0300000000002 ZT12-15 1213.1825 1152.46 1273.905 ZT16-19 1347.0700000000002 1347.0700000000002 1347.0700000000002 ZT20-23 1069.458 1069.458 1069.458