condition mean min max ZT0-3 1381.417741 1381.417741 1381.417741 ZT4-7 1499.287423 1499.287423 1499.287423 ZT8-11 941.2327700000001 941.2327700000001 941.2327700000001 ZT12-15 1050.2201385 1050.2201385 1050.2201385 ZT16-19 955.623775 955.623775 955.623775 ZT20-23 725.9000739999999 725.9000739999999 725.9000739999999