condition mean min max ZT0-3 16.99305 16.99305 16.99305 ZT4-7 6.502525 6.502525 6.502525 ZT8-11 7.122294999999999 7.122294999999999 7.122294999999999 ZT12-15 14.0718 14.0718 14.0718 ZT16-19 23.0509 23.0509 23.0509 ZT20-23 24.0549 24.0549 24.0549