condition mean min max ZT0-3 18.26885 16.021900000000002 19.90835 ZT4-7 14.534749999999999 14.534749999999999 14.534749999999999 ZT8-11 10.897749999999998 10.897749999999998 10.897749999999998 ZT12-15 16.394775000000003 15.664950000000001 17.1246 ZT16-19 15.063200000000002 15.063200000000002 15.063200000000002 ZT20-23 17.2029 17.2029 17.2029