condition mean min max ZT0-3 1353.493932 1353.493932 1353.493932 ZT4-7 952.7543105 952.7543105 952.7543105 ZT8-11 1315.2928125 1315.2928125 1315.2928125 ZT12-15 1660.2707274999998 1660.2707274999998 1660.2707274999998 ZT16-19 2077.2052435 2077.2052435 2077.2052435 ZT20-23 1191.627359 1191.627359 1191.627359