condition mean min max ZT0-3 246.933443 246.933443 246.933443 ZT4-7 216.985819 216.985819 216.985819 ZT8-11 376.15005900000006 376.15005900000006 376.15005900000006 ZT12-15 304.9887435 304.9887435 304.9887435 ZT16-19 303.106377 303.106377 303.106377 ZT20-23 323.9864545 323.9864545 323.9864545