condition mean min max ZT0-3 0.975313 0.975313 0.975313 ZT4-7 0.42545750000000004 0.42545750000000004 0.42545750000000004 ZT8-11 0.300613 0.300613 0.300613 ZT12-15 0.5110304999999999 0.5110304999999999 0.5110304999999999 ZT16-19 0.379462 0.379462 0.379462 ZT20-23 0.7628446666666666 0.7628446666666666 0.7628446666666666