condition mean min max ZT0-3 28.781499999999998 25.563299999999998 31.999699999999997 ZT4-7 13.8202 13.8202 13.8202 ZT8-11 12.23265 12.23265 12.23265 ZT12-15 0 0 0 ZT16-19 21.168950000000002 21.168950000000002 21.168950000000002 ZT20-23 22.83295 22.83295 22.83295