Table 1—

Summary statistics for explanatory variables

VariableAll patients
Patients invited to eye vans
MeanMinimumMaximumMeanMinimumMaximum
Sex
    Male0.54010.5601
    Female0.46010.4401
Age (years)62.771210263.4212101
A1C
    Excellent <7%0.38010.4001
    Good 7–8%0.29010.2901
    Unsatisfactory 8–9%0.17010.1601
    Poor >9%0.16010.1501
Duration of diabetes (years)7.340747.21074
Blood pressure (mean arterial pressure)97.3256154.6797.7356.66153.33
Smoking status
    Nonsmoker0.40010.4001
    Ex-smoker0.40010.4201
    Smoker0.20010.1801
Accessibility to service (min)11.71087.165.24087.16
Carstairs deprivation
    1 Least deprived0.17010.1801
    20.16010.2101
    30.19010.2201
    40.23010.2401
    5 Most deprived0.25010.1501
Screening location
    Ninewells Hospital0.4701
    Eye van0.5201
Urban rural classification
    Dundee0.4101
    Other urban0.37010.6501
    Rural0.22010.3501