condition mean min max ZT0-3 1051.7711666666667 888.44 1304.6 ZT4-7 886.7864999999999 886.7864999999999 886.7864999999999 ZT8-11 991.3340000000001 991.3340000000001 991.3340000000001 ZT12-15 1325.1399999999999 1225.935 1424.345 ZT16-19 1618.365 1618.365 1618.365 ZT20-23 1516.0549999999998 1516.0549999999998 1516.0549999999998