condition mean min max ZT0-3 17.58475 16.6941 18.4754 ZT4-7 23.567749999999997 23.567749999999997 23.567749999999997 ZT8-11 28.920749999999998 28.920749999999998 28.920749999999998 ZT12-15 0 0 0 ZT16-19 29.879550000000002 29.879550000000002 29.879550000000002 ZT20-23 24.0385 24.0385 24.0385