condition mean min max ZT0-3 0.706142 0.6565135 0.7557705 ZT4-7 0.812511 0.812511 0.812511 ZT8-11 2.33331 2.33331 2.33331 ZT12-15 0 0 0 ZT16-19 1.372195 1.372195 1.372195 ZT20-23 1.178105 1.178105 1.178105