condition mean min max ZT0-3 85.69256092 51.78231516 119.60280668000001 ZT4-7 151.24411245 151.0868684 151.40135650000002 ZT8-11 72.46813717675 47.2522314835 97.68404287000001 ZT12-15 7.497329411500001 6.922239187500001 8.072419635500001 ZT16-19 15.896424952499999 14.66205044 17.130799465 ZT20-23 13.479570009500002 10.817075959 16.142064060000003