condition mean min max ZT0-3 0.630188 0.630188 0.630188 ZT4-7 0.261949 0.261949 0.261949 ZT8-11 0.595832 0.595832 0.595832 ZT12-15 0.37672500000000003 0.37672500000000003 0.37672500000000003 ZT16-19 0.6943440000000001 0.6943440000000001 0.6943440000000001 ZT20-23 0.4583105 0.4583105 0.4583105