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Table 2 Descriptive statistics, potentially confounding characteristics (TILDA)

From: Road traffic noise and cognitive function in older adults: a cross-sectional investigation of The Irish Longitudinal Study on Ageing

Variable Category n (%)
Age class 50–64 707 (41.4)
  65–74 594 (34.8)
  75–84 323 (18.9)
  85+ 82 (4.8)
Female   943 (55.3)
Married   1129 (66.2)
Employment Employed 485 (28.4)
  Retired 921 (54.0)
  Other 300 (17.6)
Highest education a Primary or none 404 (23.7)
  Secondary 582 (34.1)
  Tertiary or above 720 (42.2)
Household income €0 to €10,000 55 (3.2)
  €10,000 to €20,000 256 (15.0)
  €20,000 to €40,000 490 (28.7)
  €40,000 to €70,000 373 (21.9)
  €70,000 to €120,000 180 (10.6)
  €120,000 or above 34 (2.0)
  Missing data 318 (18.6)
Physical activity b None 182 (10.7)
  Low 478 (28.0)
  Moderate 695 (40.7)
  High 351 (20.6)
Social connectedness c Most isolated 141 (8.3)
  Moderately isolated 501 (29.4)
  Moderately integrated 681 (39.9)
  Most integrated 365 (21.4)
  Missing data 18 (1.1)
Long-term health limitation   431 (25.3)
Alcohol problem d   217 (12.7)
Polypharmacy e   452 (26.5)
Total observations   1706 (100.0)
  1. Source: TILDA
  2. a In Ireland, primary education generally caters for students between 4 and 11 years, and secondary education between 12 and 18 years
  3. b Physical activity is categorised on the International Physical Activity Questionnaire scale [58]
  4. c Social connectedness is categorised on the Berkman-Syme Social Network Index [59]
  5. d Alcohol problem is determined by the respondent’s outcome on the CAGE problematic alcohol scale [60]
  6. e In TILDA, polypharmacy indicates the regular use of at least 5 different medications