condition mean min max ZT0-3 2.2581350000000002 2.2581350000000002 2.2581350000000002 ZT4-7 1.42143 1.42143 1.42143 ZT8-11 1.1586515 1.1586515 1.1586515 ZT12-15 2.6429549999999997 2.6429549999999997 2.6429549999999997 ZT16-19 3.948585 3.948585 3.948585 ZT20-23 3.130375 3.130375 3.130375