condition mean min max ZT0-3 0.792926 0.792926 0.792926 ZT4-7 0.610044 0.610044 0.610044 ZT8-11 0.6624885 0.6624885 0.6624885 ZT12-15 0.83162 0.83162 0.83162 ZT16-19 0.6408940000000001 0.6408940000000001 0.6408940000000001 ZT20-23 0.704097 0.704097 0.704097