condition mean min max ZT0-3 25.433204 25.433204 25.433204 ZT4-7 34.5159735 34.5159735 34.5159735 ZT8-11 36.142793499999996 36.142793499999996 36.142793499999996 ZT12-15 29.8365885 29.8365885 29.8365885 ZT16-19 21.8781055 21.8781055 21.8781055 ZT20-23 22.919441 22.919441 22.919441