condition mean min max ZT0-3 13.53605 13.53605 13.53605 ZT4-7 10.3431 10.3431 10.3431 ZT8-11 11.091550000000002 11.091550000000002 11.091550000000002 ZT12-15 12.2757 12.2757 12.2757 ZT16-19 15.639700000000001 15.639700000000001 15.639700000000001 ZT20-23 14.189900000000002 14.189900000000002 14.189900000000002