condition mean min max ZT0-3 18.914299999999997 14.7625 23.0661 ZT4-7 27.87915 27.87915 27.87915 ZT8-11 8.88944 8.88944 8.88944 ZT12-15 0 0 0 ZT16-19 9.06122 9.06122 9.06122 ZT20-23 26.96965 26.96965 26.96965