condition mean min max ZT0-3 11.4933 11.4933 11.4933 ZT4-7 5.57745 5.57745 5.57745 ZT8-11 13.23425 13.23425 13.23425 ZT12-15 30.46775 30.46775 30.46775 ZT16-19 34.5077 34.5077 34.5077 ZT20-23 19.8596 19.8596 19.8596