condition mean min max ZT0-3 10.798279 10.798279 10.798279 ZT4-7 10.611036 10.611036 10.611036 ZT8-11 11.9813765 11.9813765 11.9813765 ZT12-15 13.0609495 13.0609495 13.0609495 ZT16-19 11.019388 11.019388 11.019388 ZT20-23 9.9837795 9.9837795 9.9837795