condition mean min max ZT0-3 1.3330863929999999 1.077761923 1.588410863 ZT4-7 3.5231584815 2.3523174659999997 4.693999497 ZT8-11 7.3411940399999995 4.9122997375 9.7700883425 ZT12-15 12.898563149 11.566258869999999 14.230867428 ZT16-19 9.696592095 8.845650791499999 10.5475333985 ZT20-23 10.549134187 9.145830712 11.952437662000001