condition mean min max ZT0-3 256.142556 256.142556 256.142556 ZT4-7 184.7800345 184.7800345 184.7800345 ZT8-11 186.0025085 186.0025085 186.0025085 ZT12-15 201.851404 201.851404 201.851404 ZT16-19 241.87642449999998 241.87642449999998 241.87642449999998 ZT20-23 254.0866835 254.0866835 254.0866835