condition mean min max ZT0-3 89.615689 89.615689 89.615689 ZT4-7 297.390804 297.390804 297.390804 ZT8-11 375.1563605 375.1563605 375.1563605 ZT12-15 335.68393349999997 335.68393349999997 335.68393349999997 ZT16-19 189.1148035 189.1148035 189.1148035 ZT20-23 127.7204265 127.7204265 127.7204265