condition mean min max ZT0-3 10.141265 10.141265 10.141265 ZT4-7 10.509971 10.509971 10.509971 ZT8-11 12.791704 12.791704 12.791704 ZT12-15 10.935512 10.935512 10.935512 ZT16-19 13.456898 13.456898 13.456898 ZT20-23 13.701160999999999 13.701160999999999 13.701160999999999