condition mean min max ZT0-3 6.658455 6.658455 6.658455 ZT4-7 0.0 0.0 0.0 ZT8-11 1.30556 1.30556 1.30556 ZT12-15 4.230055 4.230055 4.230055 ZT16-19 0.0 0.0 0.0 ZT20-23 9.728485 9.728485 9.728485