condition mean min max ZT0-3 516.544151 516.544151 516.544151 ZT4-7 341.608206 341.608206 341.608206 ZT8-11 404.368588 404.368588 404.368588 ZT12-15 475.7775035 475.7775035 475.7775035 ZT16-19 447.194882 447.194882 447.194882 ZT20-23 375.835651 375.835651 375.835651