condition mean min max ZT0-3 1.9413173977500002 1.427105443 2.4555293525 ZT4-7 4.1891829595 3.1403575564999997 5.2380083625000005 ZT8-11 9.6199239735 7.481626812 11.758221135 ZT12-15 10.531107009500001 9.593462667 11.468751352 ZT16-19 8.88516859825 8.6730649375 9.097272259 ZT20-23 7.377480251250001 7.3610092505 7.393951252