condition mean min max ZT0-3 5.9771 5.963895 5.990304999999999 ZT4-7 4.736784999999999 4.736784999999999 4.736784999999999 ZT8-11 3.6677150000000003 3.6677150000000003 3.6677150000000003 ZT12-15 0 0 0 ZT16-19 8.024085 8.024085 8.024085 ZT20-23 7.502405 7.502405 7.502405