condition mean min max ZT0-3 388.24229615 276.28136489999997 500.2032274 ZT4-7 104.025389105 85.60344022500001 122.44733798499999 ZT8-11 24.489993299749997 12.50088605 36.4791005495 ZT12-15 5.061049929999999 4.774359897 5.3477399629999995 ZT16-19 13.05857486675 9.7325282485 16.384621485 ZT20-23 43.4314702475 29.324091435 57.538849060000004