condition mean min max ZT0-3 0.0 0.0 0.0 ZT4-7 0.418981 0.418981 0.418981 ZT8-11 0.210213 0.210213 0.210213 ZT12-15 0 0 0 ZT16-19 0.419008 0.419008 0.419008 ZT20-23 0.0 0.0 0.0