condition mean min max ZT0-3 14.483079 14.483079 14.483079 ZT4-7 14.8407395 14.8407395 14.8407395 ZT8-11 16.1594655 16.1594655 16.1594655 ZT12-15 14.240818 14.240818 14.240818 ZT16-19 15.824320499999999 15.824320499999999 15.824320499999999 ZT20-23 15.203956999999999 15.203956999999999 15.203956999999999