table row not selecting

t = readtable('patients.xls')
tNew = t(1:5, :) % Extract first 5 rows only.
% Get a LastName variable from column 1
LastName = tNew{:, 1}
tNew.Properties.RowNames = LastName'

tNew =
  5×10 table
                  LastName        Gender      Age              Location               Height    Weight    Smoker    Systolic    Diastolic    SelfAssessedHealthStatus
                ____________    __________    ___    _____________________________    ______    ______    ______    ________    _________    ________________________
    Smith       {'Smith'   }    {'Male'  }    38     {'County General Hospital'  }      71       176      true        124          93             {'Excellent'}      
    Johnson     {'Johnson' }    {'Male'  }    43     {'VA Hospital'              }      69       163      false       109          77             {'Fair'     }      
    Williams    {'Williams'}    {'Female'}    38     {'St. Mary's Medical Center'}      64       131      false       125          83             {'Good'     }      
    Jones       {'Jones'   }    {'Female'}    40     {'VA Hospital'              }      67       133      false       117          75             {'Fair'     }      
    Brown       {'Brown'   }    {'Female'}    49     {'County General Hospital'  }      64       119      false       122          80             {'Good'     }   