condition mean min max ZT0-3 3.3322848325 3.2093653910000004 3.455204274 ZT4-7 3.2782736662499996 2.6982739505 3.8582733819999997 ZT8-11 3.8212672105000003 3.6122062335 4.0303281875 ZT12-15 3.8482013017499996 3.1948282015 4.501574401999999 ZT16-19 6.005617649 5.295954412 6.715280886 ZT20-23 10.211642869 8.679071795 11.744213943