condition mean min max ZT0-3 11.376994999999999 10.015789999999999 12.738199999999999 ZT4-7 4.71084 4.71084 4.71084 ZT8-11 6.75631 6.75631 6.75631 ZT12-15 0 0 0 ZT16-19 10.5291 10.5291 10.5291 ZT20-23 6.2008 6.2008 6.2008