condition mean min max ZT0-3 0.524092 0.5100825 0.5381015 ZT4-7 0.6555475 0.6555475 0.6555475 ZT8-11 0.2531078 0.2531078 0.2531078 ZT12-15 0 0 0 ZT16-19 0.82331 0.82331 0.82331 ZT20-23 1.11548 1.11548 1.11548