condition mean min max ZT0-3 10.536346666666665 10.10944 11.161259999999999 ZT4-7 4.986095000000001 4.986095000000001 4.986095000000001 ZT8-11 2.8709100000000003 2.8709100000000003 2.8709100000000003 ZT12-15 2.608835 2.5863300000000002 2.63134 ZT16-19 2.183105 2.183105 2.183105 ZT20-23 4.990130000000001 4.990130000000001 4.990130000000001