condition mean min max ZT0-3 10.245775 10.245775 10.245775 ZT4-7 9.156772 9.156772 9.156772 ZT8-11 10.0023745 10.0023745 10.0023745 ZT12-15 9.3125325 9.3125325 9.3125325 ZT16-19 9.2486775 9.2486775 9.2486775 ZT20-23 9.660763 9.660763 9.660763