condition mean min max ZT0-3 14.696425 14.372399999999999 15.02045 ZT4-7 16.88005 16.88005 16.88005 ZT8-11 12.088799999999999 12.088799999999999 12.088799999999999 ZT12-15 0 0 0 ZT16-19 13.67465 13.67465 13.67465 ZT20-23 14.857800000000001 14.857800000000001 14.857800000000001