condition mean min max ZT0-3 24.069725000000002 21.43455 26.704900000000002 ZT4-7 34.496300000000005 34.496300000000005 34.496300000000005 ZT8-11 13.33545 13.33545 13.33545 ZT12-15 0 0 0 ZT16-19 19.895 19.895 19.895 ZT20-23 30.79735 30.79735 30.79735