condition mean min max ZT0-3 22.412100000000002 22.412100000000002 22.412100000000002 ZT4-7 14.58235 14.58235 14.58235 ZT8-11 17.4167 17.4167 17.4167 ZT12-15 15.2318 15.2318 15.2318 ZT16-19 25.508000000000003 25.508000000000003 25.508000000000003 ZT20-23 25.37005 25.37005 25.37005