condition mean min max ZT0-3 35.0412688575 30.532388055 39.55014966 ZT4-7 23.462795229999998 20.63845841 26.28713205 ZT8-11 17.020343835 16.192860075 17.847827595 ZT12-15 6.695425478 4.7842815115 8.6065694445 ZT16-19 7.41913932825 6.094869216499999 8.74340944 ZT20-23 10.440407328749998 10.0334047185 10.847409938999999