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Table 2 Descriptive statistics of environmental exposure in the residential township (n = 349) of the study subjects

From: Effects of physical and social environments on the risk of dementia among Taiwanese older adults: a population-based case-control study

Environmental featuresPercentile
MinMaxMean ± SDaMedian33th66th
Physical environments
 Parks, greeneries, and square areab025.980.54 ± 1.500.290.170.42
 Playgrounds and sport venuesb0156.231.42 ± 8.580.210.110.46
 Community centersc0324.7542.68 ± 43.4531.9015.2849.13
Social environments
 Median annual family incomed339829507.24 ± 68.02494473519
 Illiterate people aged65 (%)0.2255.9318.69 ± 11.0416.2912.6522.21
 Elderly living alonee0539.2938.91 ± 51.7419.1513.7232.26
  1. aSD Standard deviation
  2. b km2/per105 people
  3. c number/per 105 people
  4. d 1000 New Taiwan Dollars
  5. e number / per103 elderly people