condition mean min max ZT0-3 14.53505 11.40485 17.04735 ZT4-7 7.68543 7.68543 7.68543 ZT8-11 10.991905 10.991905 10.991905 ZT12-15 14.553500000000001 13.084900000000001 16.022100000000002 ZT16-19 16.20865 16.20865 16.20865 ZT20-23 17.6507 17.6507 17.6507