condition mean min max ZT0-3 12.794483333333334 11.503 13.83145 ZT4-7 12.8339 12.8339 12.8339 ZT8-11 19.79615 19.79615 19.79615 ZT12-15 21.517400000000002 18.91855 24.11625 ZT16-19 18.77935 18.77935 18.77935 ZT20-23 13.4716 13.4716 13.4716