condition mean min max ZT0-3 7.9602450000000005 6.971080000000001 8.94941 ZT4-7 13.4692 13.4692 13.4692 ZT8-11 12.566500000000001 12.566500000000001 12.566500000000001 ZT12-15 0 0 0 ZT16-19 6.892765 6.892765 6.892765 ZT20-23 6.6173649999999995 6.6173649999999995 6.6173649999999995