condition mean min max ZT0-3 0.43776566666666666 0.2532885 0.5818004999999999 ZT4-7 0.208493 0.208493 0.208493 ZT8-11 0.2101975 0.2101975 0.2101975 ZT12-15 0.44014175 0.23230449999999997 0.6479790000000001 ZT16-19 0.48426199999999997 0.48426199999999997 0.48426199999999997 ZT20-23 1.0103725 1.0103725 1.0103725