condition mean min max ZT0-3 11.72095 11.31325 12.12865 ZT4-7 8.528625 8.528625 8.528625 ZT8-11 4.23536 4.23536 4.23536 ZT12-15 0 0 0 ZT16-19 5.831415 5.831415 5.831415 ZT20-23 6.074954999999999 6.074954999999999 6.074954999999999