condition mean min max ZT0-3 13.4128 13.4128 13.4128 ZT4-7 8.780719999999999 8.780719999999999 8.780719999999999 ZT8-11 5.16948 5.16948 5.16948 ZT12-15 4.6157699999999995 4.6157699999999995 4.6157699999999995 ZT16-19 9.4779 9.4779 9.4779 ZT20-23 12.29735 12.29735 12.29735