condition mean min max ZT0-3 3.5699775000000002 2.54755 4.592405 ZT4-7 3.5134100000000004 3.5134100000000004 3.5134100000000004 ZT8-11 3.529795 3.529795 3.529795 ZT12-15 0 0 0 ZT16-19 12.238205 12.238205 12.238205 ZT20-23 6.010730000000001 6.010730000000001 6.010730000000001