condition mean min max ZT0-3 49.825654 49.825654 49.825654 ZT4-7 48.775855500000006 48.775855500000006 48.775855500000006 ZT8-11 60.9877525 60.9877525 60.9877525 ZT12-15 48.927741499999996 48.927741499999996 48.927741499999996 ZT16-19 37.279885500000006 37.279885500000006 37.279885500000006 ZT20-23 37.3061445 37.3061445 37.3061445