condition mean min max ZT0-3 12.816500000000001 12.816500000000001 12.816500000000001 ZT4-7 15.998249999999999 15.998249999999999 15.998249999999999 ZT8-11 15.236249999999998 15.236249999999998 15.236249999999998 ZT12-15 10.320055 10.320055 10.320055 ZT16-19 12.37695 12.37695 12.37695 ZT20-23 11.110299999999999 11.110299999999999 11.110299999999999