condition mean min max ZT0-3 2.1071525 1.872915 2.34139 ZT4-7 2.600355 2.600355 2.600355 ZT8-11 0.13476725 0.13476725 0.13476725 ZT12-15 0 0 0 ZT16-19 0.21910400000000002 0.21910400000000002 0.21910400000000002 ZT20-23 0.351732 0.351732 0.351732