condition mean min max ZT0-3 16.491149999999998 16.491149999999998 16.491149999999998 ZT4-7 14.32515 14.32515 14.32515 ZT8-11 11.35985 11.35985 11.35985 ZT12-15 9.728285 9.728285 9.728285 ZT16-19 11.994250000000001 11.994250000000001 11.994250000000001 ZT20-23 11.588750000000001 11.588750000000001 11.588750000000001