condition mean min max ZT0-3 12.861225 12.58325 13.139199999999999 ZT4-7 11.43595 11.43595 11.43595 ZT8-11 10.295185 10.295185 10.295185 ZT12-15 0 0 0 ZT16-19 14.59855 14.59855 14.59855 ZT20-23 11.6327 11.6327 11.6327