condition mean min max ZT0-3 18.5345 18.5345 18.5345 ZT4-7 16.997799999999998 16.997799999999998 16.997799999999998 ZT8-11 14.542 14.542 14.542 ZT12-15 13.495550000000001 13.495550000000001 13.495550000000001 ZT16-19 18.048099999999998 18.048099999999998 18.048099999999998 ZT20-23 18.5753 18.5753 18.5753