condition mean min max ZT0-3 24.55230065 20.670837130000002 28.43376417 ZT4-7 14.26282119 12.909669749999999 15.615972630000002 ZT8-11 12.7539533375 11.3328121 14.175094575 ZT12-15 13.9522126775 12.63861696 15.265808395 ZT16-19 27.2584373 19.426279825 35.090594775 ZT20-23 48.6166069525 44.950784065 52.28242984