condition mean min max ZT0-3 10.638219 10.638219 10.638219 ZT4-7 10.443749 10.443749 10.443749 ZT8-11 11.855440000000002 11.855440000000002 11.855440000000002 ZT12-15 11.7291035 11.7291035 11.7291035 ZT16-19 9.757121999999999 9.757121999999999 9.757121999999999 ZT20-23 10.1894375 10.1894375 10.1894375