condition mean min max ZT0-3 14.58905 14.204 15.307599999999999 ZT4-7 11.33935 11.33935 11.33935 ZT8-11 12.1235 12.1235 12.1235 ZT12-15 12.457049999999999 12.1897 12.7244 ZT16-19 15.01695 15.01695 15.01695 ZT20-23 16.444499999999998 16.444499999999998 16.444499999999998