condition mean min max ZT0-3 77.97943333333333 45.591300000000004 108.73855 ZT4-7 38.954350000000005 38.954350000000005 38.954350000000005 ZT8-11 47.53275 47.53275 47.53275 ZT12-15 75.030875 62.31865 87.7431 ZT16-19 81.24225000000001 81.24225000000001 81.24225000000001 ZT20-23 112.95825 112.95825 112.95825