condition mean min max ZT0-3 28.049999999999997 28.049999999999997 28.049999999999997 ZT4-7 41.5 41.5 41.5 ZT8-11 49.7 49.7 49.7 ZT12-15 28.900000000000002 28.900000000000002 28.900000000000002 ZT16-19 57.800000000000004 57.800000000000004 57.800000000000004 ZT20-23 48.900000000000006 48.900000000000006 48.900000000000006