condition mean min max ZT0-3 0.4915175 0.4876975 0.4953375 ZT4-7 0.884034 0.884034 0.884034 ZT8-11 0.863858 0.863858 0.863858 ZT12-15 0 0 0 ZT16-19 0.7837755 0.7837755 0.7837755 ZT20-23 0.935692 0.935692 0.935692