condition mean min max ZT0-3 38.92958333333333 35.89035 42.1563 ZT4-7 45.5796 45.5796 45.5796 ZT8-11 68.48400000000001 68.48400000000001 68.48400000000001 ZT12-15 94.229375 93.50280000000001 94.95595 ZT16-19 82.60085 82.60085 82.60085 ZT20-23 52.6773 52.6773 52.6773