condition mean min max ZT0-3 2.20689783125 1.2633106790000002 3.1504849835 ZT4-7 10.878759549749999 8.451131179499999 13.306387919999999 ZT8-11 17.318799855 16.7356624 17.90193731 ZT12-15 14.1286993925 13.496935565000001 14.760463219999998 ZT16-19 17.575539624999998 14.665215504999999 20.485863745 ZT20-23 26.97374077 24.740001045 29.207480495