condition mean min max ZT0-3 39.306000000000004 36.585750000000004 42.026250000000005 ZT4-7 44.52785 44.52785 44.52785 ZT8-11 45.88415 45.88415 45.88415 ZT12-15 0 0 0 ZT16-19 61.60035 61.60035 61.60035 ZT20-23 47.9979 47.9979 47.9979