condition mean min max ZT0-3 70.0231 60.760400000000004 79.2858 ZT4-7 32.95625 32.95625 32.95625 ZT8-11 14.26135 14.26135 14.26135 ZT12-15 0 0 0 ZT16-19 11.671800000000001 11.671800000000001 11.671800000000001 ZT20-23 28.2406 28.2406 28.2406