condition mean min max ZT0-3 1.0567405 1.0567405 1.0567405 ZT4-7 0.593911 0.593911 0.593911 ZT8-11 0.832296 0.832296 0.832296 ZT12-15 0.5372 0.5372 0.5372 ZT16-19 1.0821995 1.0821995 1.0821995 ZT20-23 0.9514959999999999 0.9514959999999999 0.9514959999999999