condition mean min max ZT0-3 5.1951275 5.190135 5.20012 ZT4-7 2.0816600000000003 2.0816600000000003 2.0816600000000003 ZT8-11 0.584902 0.584902 0.584902 ZT12-15 0 0 0 ZT16-19 1.509675 1.509675 1.509675 ZT20-23 3.209755 3.209755 3.209755