condition mean min max ZT0-3 4.16391 4.127885 4.199935 ZT4-7 5.732845 5.732845 5.732845 ZT8-11 11.629999999999999 11.629999999999999 11.629999999999999 ZT12-15 0 0 0 ZT16-19 7.169084999999999 7.169084999999999 7.169084999999999 ZT20-23 5.5526599999999995 5.5526599999999995 5.5526599999999995