Table 1 Descriptive statistics of all candidate variables.

Disease burden of AD and other dementias

Incidence rate (per 100,000 population)

6.04

55.52 (27.30,139.26)

396.70

Death rate (per 100,000 population)

0.68

12.48 (5.74,29.34)

120.83

DALY rate (per 100,000 population)

18.74

206.94

(98.87,470.99)

1524.38

Demographic characteristics

Population density (person/sq. km.)

1.75

77.42 (28.57,141.31)

7915.73

Males (%)

45.44

49.66 (49.02,50.32)

76.71

Older population (%)

0.69

5.89 (3.32,13.37)

27.11

Socioeconomic variables

SDI

0.07

0.63 (0.47,0.76)

0.93

GNI (current US$)

220

5325 (1730,15050)

142,160

Urban population (%)

10.64

57.40 (39.39,76.61)

100.00

Primary education (years)

3

6 (5,6)

8

Medical service

Hospital beds (per 1000 population)

0.01

2.16 (1.13,3.98)

13.51

Greenness

NDVI

0.08

0.56 (0.38,0.67)

0.87

EVI

0.06

0.33 (0.22,0.42)

0.67

Air pollutants

PM_2.5 (ug/m³)

5.26

23.13 (16.20,35.45)

95.24

Population-weighted PM_2.5 (ug/m³)

1.50

15.80 (10.40,26.35)

85.10

Geographic-mean PM_2.5 (ug/m³)

1.60

14.80 (9.50,24.85)

81.30

Ozone (ppb)

15.58

39.96 (34.80,46.65)

68.35

Meteorological factors

Mean temperature (°C)

-6.05

22.07 (11.14,25.61)

29.38

Behavior factors

Smoking (%)

3.83

19.33 (12.53,27.02)

42.57

Alcohol (liters)

0.003

6.21 (2.44,9.67)

17.43