condition mean min max ZT0-3 0.4365 0.4365 0.4365 ZT4-7 0.518705 0.518705 0.518705 ZT8-11 0.447003 0.447003 0.447003 ZT12-15 0.285664 0.285664 0.285664 ZT16-19 0.0 0.0 0.0 ZT20-23 0.37416000000000005 0.37416000000000005 0.37416000000000005