condition mean min max ZT0-3 0.0 0.0 0.0 ZT4-7 0.0 0.0 0.0 ZT8-11 0.0 0.0 0.0 ZT12-15 3.8779833333333333 0.0 7.755966666666667 ZT16-19 0.0 0.0 0.0 ZT20-23 0.0 0.0 0.0