condition mean min max ZT0-3 197.155134 197.155134 197.155134 ZT4-7 220.866658 220.866658 220.866658 ZT8-11 199.8712775 199.8712775 199.8712775 ZT12-15 131.6392935 131.6392935 131.6392935 ZT16-19 84.1256585 84.1256585 84.1256585 ZT20-23 79.6955285 79.6955285 79.6955285