condition mean min max ZT0-3 0.7427391666666666 0.3570065 1.506435 ZT4-7 0.8931390000000001 0.8931390000000001 0.8931390000000001 ZT8-11 0.5399355 0.5399355 0.5399355 ZT12-15 0.5517315 0.370886 0.732577 ZT16-19 0.4942125 0.4942125 0.4942125 ZT20-23 0.46715949999999995 0.46715949999999995 0.46715949999999995