condition mean min max ZT0-3 45.324627 45.324627 45.324627 ZT4-7 38.1991645 38.1991645 38.1991645 ZT8-11 46.081998 46.081998 46.081998 ZT12-15 40.5210405 40.5210405 40.5210405 ZT16-19 48.937540999999996 48.937540999999996 48.937540999999996 ZT20-23 41.6466465 41.6466465 41.6466465