condition mean min max ZT0-3 52.848359 52.848359 52.848359 ZT4-7 50.4344765 50.4344765 50.4344765 ZT8-11 65.4319665 65.4319665 65.4319665 ZT12-15 44.042998 44.042998 44.042998 ZT16-19 67.152883 67.152883 67.152883 ZT20-23 77.39747750000001 77.39747750000001 77.39747750000001