condition mean min max ZT0-3 11.08425 10.12845 12.04005 ZT4-7 8.86354 8.86354 8.86354 ZT8-11 8.270340000000001 8.270340000000001 8.270340000000001 ZT12-15 0 0 0 ZT16-19 14.8805 14.8805 14.8805 ZT20-23 14.0258 14.0258 14.0258