condition mean min max ZT0-3 57.11735 51.660650000000004 61.3495 ZT4-7 44.02415 44.02415 44.02415 ZT8-11 24.288899999999998 24.288899999999998 24.288899999999998 ZT12-15 32.2214 27.8301 36.612700000000004 ZT16-19 32.394099999999995 32.394099999999995 32.394099999999995 ZT20-23 41.76 41.76 41.76