condition mean min max ZT0-3 12.91245 11.3156 14.16225 ZT4-7 11.8248 11.8248 11.8248 ZT8-11 7.60903 7.60903 7.60903 ZT12-15 10.9053325 10.817039999999999 10.993625 ZT16-19 9.230445 9.230445 9.230445 ZT20-23 14.434899999999999 14.434899999999999 14.434899999999999