condition mean min max ZT0-3 178.847441 178.847441 178.847441 ZT4-7 133.2322845 133.2322845 133.2322845 ZT8-11 159.44602600000002 159.44602600000002 159.44602600000002 ZT12-15 201.0832535 201.0832535 201.0832535 ZT16-19 192.471407 192.471407 192.471407 ZT20-23 261.59637299999997 261.59637299999997 261.59637299999997