condition mean min max ZT0-3 33.684804285 28.22139041 39.14821816 ZT4-7 11.983770785 7.719416358 16.248125212 ZT8-11 13.870140040999999 8.070681493 19.669598589 ZT12-15 24.1702235475 23.89323531 24.447211785 ZT16-19 28.258822092499997 27.66067683 28.856967355 ZT20-23 35.738909615 34.127603395 37.350215835