condition mean min max ZT0-3 9.946941 9.946941 9.946941 ZT4-7 10.308876999999999 10.308876999999999 10.308876999999999 ZT8-11 11.179927 11.179927 11.179927 ZT12-15 10.5916415 10.5916415 10.5916415 ZT16-19 12.106741 12.106741 12.106741 ZT20-23 10.387903 10.387903 10.387903