condition mean min max ZT0-3 14.6727 14.6522 14.693200000000001 ZT4-7 7.73288 7.73288 7.73288 ZT8-11 19.032449999999997 19.032449999999997 19.032449999999997 ZT12-15 0 0 0 ZT16-19 19.4682 19.4682 19.4682 ZT20-23 22.608150000000002 22.608150000000002 22.608150000000002