condition mean min max ZT0-3 2173.214215 2173.214215 2173.214215 ZT4-7 2433.512117 2433.512117 2433.512117 ZT8-11 2445.110366 2445.110366 2445.110366 ZT12-15 2509.1821295 2509.1821295 2509.1821295 ZT16-19 2256.9599515 2256.9599515 2256.9599515 ZT20-23 2367.4707675 2367.4707675 2367.4707675