condition mean min max ZT0-3 10.537086666666667 9.764275 11.55045 ZT4-7 8.100764999999999 8.100764999999999 8.100764999999999 ZT8-11 10.95485 10.95485 10.95485 ZT12-15 16.96195 14.956199999999999 18.9677 ZT16-19 12.55875 12.55875 12.55875 ZT20-23 13.610800000000001 13.610800000000001 13.610800000000001