condition mean min max ZT0-3 69.313781 69.313781 69.313781 ZT4-7 76.32609550000001 76.32609550000001 76.32609550000001 ZT8-11 73.1811595 73.1811595 73.1811595 ZT12-15 69.832049 69.832049 69.832049 ZT16-19 59.773056999999994 59.773056999999994 59.773056999999994 ZT20-23 60.5007485 60.5007485 60.5007485