condition mean min max ZT0-3 12.746816 12.746816 12.746816 ZT4-7 11.866522 11.866522 11.866522 ZT8-11 12.7845245 12.7845245 12.7845245 ZT12-15 10.313333 10.313333 10.313333 ZT16-19 11.4165895 11.4165895 11.4165895 ZT20-23 11.1123265 11.1123265 11.1123265