condition mean min max ZT0-3 1.2571775 1.2435800000000001 1.270775 ZT4-7 1.352014 1.352014 1.352014 ZT8-11 0.177312 0.177312 0.177312 ZT12-15 0 0 0 ZT16-19 0.11497740000000001 0.11497740000000001 0.11497740000000001 ZT20-23 0.289662 0.289662 0.289662