condition mean min max ZT0-3 9.86456 9.86456 9.86456 ZT4-7 10.254294999999999 10.254294999999999 10.254294999999999 ZT8-11 10.1689525 10.1689525 10.1689525 ZT12-15 9.378896 9.378896 9.378896 ZT16-19 11.1349605 11.1349605 11.1349605 ZT20-23 12.14152 12.14152 12.14152