condition mean min max ZT0-3 36.407849999999996 35.94029999999999 36.8754 ZT4-7 31.69445 31.69445 31.69445 ZT8-11 29.545450000000002 29.545450000000002 29.545450000000002 ZT12-15 0 0 0 ZT16-19 37.62025 37.62025 37.62025 ZT20-23 39.09065 39.09065 39.09065