condition mean min max ZT0-3 88.750516 88.750516 88.750516 ZT4-7 60.4363135 60.4363135 60.4363135 ZT8-11 47.483408 47.483408 47.483408 ZT12-15 54.901720499999996 54.901720499999996 54.901720499999996 ZT16-19 40.3914985 40.3914985 40.3914985 ZT20-23 44.610622 44.610622 44.610622