condition mean min max ZT0-3 0.4626775 0.0 0.925355 ZT4-7 0.273745 0.273745 0.273745 ZT8-11 0.0 0.0 0.0 ZT12-15 0.5613472500000001 0.0 1.1226945000000002 ZT16-19 0.693736 0.631458 0.7560140000000001 ZT20-23 0 0 0