condition mean min max ZT0-3 12.914900000000001 12.179400000000001 13.650400000000001 ZT4-7 18.81215 18.81215 18.81215 ZT8-11 21.14755 21.14755 21.14755 ZT12-15 0 0 0 ZT16-19 18.2117 18.2117 18.2117 ZT20-23 16.681150000000002 16.681150000000002 16.681150000000002