condition mean min max ZT0-3 0.28963174999999997 0.2798525 0.299411 ZT4-7 1.664635 1.664635 1.664635 ZT8-11 5.30465 5.30465 5.30465 ZT12-15 0 0 0 ZT16-19 2.086005 2.086005 2.086005 ZT20-23 0.852426 0.852426 0.852426