condition mean min max ZT0-3 0.551462 0.551462 0.551462 ZT4-7 0.2388135 0.2388135 0.2388135 ZT8-11 0.1178061 0.1178061 0.1178061 ZT12-15 1.05206 1.05206 1.05206 ZT16-19 0.8707995 0.8707995 0.8707995 ZT20-23 0.573445 0.573445 0.573445