condition mean min max ZT0-3 11.8512 3.8222 19.880200000000002 ZT4-7 13.84725 13.84725 13.84725 ZT8-11 2.97935 2.97935 2.97935 ZT12-15 0 0 0 ZT16-19 7.8166 7.8166 7.8166 ZT20-23 4.04919 4.04919 4.04919