condition mean min max ZT0-3 1.7182472135000002 0.36427502100000003 3.0722194060000003 ZT4-7 6.15583667425 5.596237927 6.7154354215 ZT8-11 4.53231784275 4.1535678735 4.911067812000001 ZT12-15 5.953939525000001 5.1371565635000005 6.7707224865 ZT16-19 6.748344652749999 5.266983189499999 8.229706116 ZT20-23 29.265027005 14.860658885 43.669395125