condition mean min max ZT0-3 12.685265 12.685265 12.685265 ZT4-7 12.0263765 12.0263765 12.0263765 ZT8-11 13.2844625 13.2844625 13.2844625 ZT12-15 11.3225215 11.3225215 11.3225215 ZT16-19 12.448811 12.448811 12.448811 ZT20-23 12.8517925 12.8517925 12.8517925