condition mean min max ZT0-3 185.960409 185.960409 185.960409 ZT4-7 173.4570855 173.4570855 173.4570855 ZT8-11 194.548659 194.548659 194.548659 ZT12-15 223.7390465 223.7390465 223.7390465 ZT16-19 214.680606 214.680606 214.680606 ZT20-23 223.805151 223.805151 223.805151