condition mean min max ZT0-3 112.479345 112.479345 112.479345 ZT4-7 122.4472105 122.4472105 122.4472105 ZT8-11 119.6084355 119.6084355 119.6084355 ZT12-15 112.11427549999999 112.11427549999999 112.11427549999999 ZT16-19 120.0018395 120.0018395 120.0018395 ZT20-23 126.996103 126.996103 126.996103