condition mean min max ZT0-3 79.627889 79.627889 79.627889 ZT4-7 120.369861 120.369861 120.369861 ZT8-11 188.184928 188.184928 188.184928 ZT12-15 186.4251445 186.4251445 186.4251445 ZT16-19 145.40651200000002 145.40651200000002 145.40651200000002 ZT20-23 113.9826755 113.9826755 113.9826755