condition mean min max ZT0-3 63.103385 63.103385 63.103385 ZT4-7 94.8472875 94.8472875 94.8472875 ZT8-11 48.683748 48.683748 48.683748 ZT12-15 64.9402875 64.9402875 64.9402875 ZT16-19 49.3131535 49.3131535 49.3131535 ZT20-23 89.7739265 89.7739265 89.7739265