Table 1

Incidence rates of dementia during follow-up by characteristics of eligible subjects estimated at baseline 

Baseline variableGroupingAll subjectsFirst diagnosis of dementia 2005–2013†
AnyAlzheimer’s diseaseVascularNon-specific
n%nIR*nIR*nIR*nIR*
All130 97810021812.408480.936340.697470.82
SexMen65 13049.79482.143260.733010.683440.78
Women65 84850.312332.635221.113330.714030.86
Age50–5959 58745.5990.23380.09170.04450.11
60–6941 01331.34271.491750.611020.361550.54
70–7930 37823.216558.276353.145152.545472.70
EthnicityWhite86 89666.317912.847031.115240.836070.96
Asian73095.6981.77350.63390.70270.49
Black42873.31013.29321.04321.04371.20
Unknown32 48624.81910.98780.40390.20760.39
SmokingNever63 47848.511082.424731.032930.643620.79
Ex33 06325.27153.102641.142351.012351.01
Current25 73319.73081.76950.54890.511330.76
Missing87046.7501.09160.35170.37170.37
BMI<2051884.01735.09661.93521.52581.69
20–2535 64227.27022.812761.102010.802370.94
25–3041 28131.57212.443041.022020.682380.80
30+25 78319.73641.971160.631290.701250.68
Missing23 08417.62211.51860.59500.34890.61
IHDYes99287.63425.21911.381412.141171.77
No121 05092.418392.187570.894930.586300.74
StrokeYes36472.81908.38401.74994.33572.49
No127 33197.219912.248080.915350.606900.77
DiabetesYes10 1607.83004.34851.221141.641091.57
No120 81892.218812.247630.905200.626380.76
Heart failureYes17041.3626.7690.97262.81272.92
No129 27498.721192.358390.936080.677200.80
IMD‡1 (least)26 14920.04262.211630.841320.681440.75
231 45224.05352.362120.931460.641880.83
326 09319.94012.291791.021120.641190.68
430 81723.55142.491870.901600.771760.85
5 (most)16 46712.63052.781070.97840.761201.09
BoroughInner23 11117.63902.511230.791340.861430.92
Outer107 86782.417912.377250.965000.666040.80
Registration length (years)<1040 38630.86382.412510.941960.742100.79
10+90 59269.215432.395970.924380.685370.83
  • *Incidence rate per 1000 patients per year.

  • †n=48 patients appear in both Alzheimer’s disease and vascular dementia categories.

  • ‡These groups correspond to the fifths of the IMD ranking across England; thus, Greater London is under-represented in the most deprived fifth.

  • BMI, body mass index; IHD, ischaemic heart disease; IMD, Index of Multiple Deprivation.