condition mean min max ZT0-3 28.985300000000002 26.8532 31.117400000000004 ZT4-7 13.297845 13.297845 13.297845 ZT8-11 22.8884 22.8884 22.8884 ZT12-15 0 0 0 ZT16-19 44.905550000000005 44.905550000000005 44.905550000000005 ZT20-23 39.15795 39.15795 39.15795