condition mean min max ZT0-3 4.5240100000000005 4.5240100000000005 4.5240100000000005 ZT4-7 3.137455 3.137455 3.137455 ZT8-11 2.833925 2.833925 2.833925 ZT12-15 4.03782 4.03782 4.03782 ZT16-19 6.260535 6.260535 6.260535 ZT20-23 4.656314999999999 4.656314999999999 4.656314999999999