condition mean min max ZT0-3 0.49000275 0.3929475 0.587058 ZT4-7 0.3094405 0.3094405 0.3094405 ZT8-11 0.24438695 0.24438695 0.24438695 ZT12-15 0 0 0 ZT16-19 0.908615 0.908615 0.908615 ZT20-23 0.5860965 0.5860965 0.5860965