Table 1

Characteristics of the participants and the prevalence of stroke and individuals at high risk of stroke

CategorySubcategorySurvey population (n, (%))Participants with stroke, % (95% CI)
(n=233)
Participants at high risk of stroke, % (95% CI)
(n=2630)
Overall10 056 (100)2.32 (2.02 to 2.61)26.2 (25.3 to 27.0)
ASR2.11 (1.81 to 2.41)23.8 (27.2 to 29.1)
SexMale4467 (44.4)2.64 (2.17 to 3.11)30.5 (29.1 to 31.8)
Female5589 (55.6)2.06 (1.69 to 2.43)22.7 (21.6 to 23.8)
P value<0.0010.062<0.001
Age (years)40–491896 (18.9)0.90 (0.47 to 1.32)20.1 (18.3 to 21.9)
50–593105 (30.9)1.55 (1.11 to 1.98)26.5 (25.0 to 28.1)
60–692549 (25.3)2.43 (1.83 to 3.03)27.4 (25.7 to 29.1)
70–791859 (18.5)3.93 (3.04 to 4.81)28.1 (26.0 to 30.1)
≥80647 (6.4)5.10 (3.40 to 6.80)31.7 (28.1 to 35.3)
P value<0.001<0.001<0.001
ResidenceLow-altitude3051 (30.3)1.67 (1.21 to 2.13)24.2 (22.7 to 25.7)
Mid-altitude4869 (48.4)2.14 (1.73 to 2.54)30.0 (28.6 to 31.2)
High-altitude2136 (21.2)3.65 (2.86 to 4.44)20.4 (18.7 to 22.1)
P value<0.001<0.001<0.001
EthnicityHan6610 (65.7)1.98 (1.65 to 2.32)28.1 (27.0 to 29.1)
Tibetan2260 (22.5)3.63 (2.86 to 4.40)20.8 (19.2 to 22.5)
Hui802 (8.0)1.50 (0.66 to 2.34)23.3 (20.4 to 26.2)
Others384 (3.8)2.08 (0.65 to 3.51)30.5 (25.9 to 35.1)
P value<0.001<0.001<0.001
  • P values were calculated with the Rao-Scott-χ2 test and were intragroup comparisons of the surveyed population/participants with stroke/participants at high risk of stroke were calculated with the Rao-Scott-χ2 test.

  • ASR, age-standardised rates for the Chinese population 2010.