condition mean min max ZT0-3 0.2897016666666667 0.0 0.4483435 ZT4-7 0.0 0.0 0.0 ZT8-11 0.0 0.0 0.0 ZT12-15 0.210922 0.0 0.421844 ZT16-19 0.0 0.0 0.0 ZT20-23 0.0 0.0 0.0