condition mean min max ZT0-3 1.594897 0.8270010000000001 2.146695 ZT4-7 1.0027625 1.0027625 1.0027625 ZT8-11 0.8332 0.8332 0.8332 ZT12-15 1.114528 0.750869 1.478187 ZT16-19 0.57273 0.57273 0.57273 ZT20-23 1.59152 1.59152 1.59152