condition mean min max ZT0-3 14.540975 12.8339 16.24805 ZT4-7 20.37865 20.37865 20.37865 ZT8-11 12.7573 12.7573 12.7573 ZT12-15 0 0 0 ZT16-19 0.5900495 0.5900495 0.5900495 ZT20-23 2.221765 2.221765 2.221765