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Table 3 Descriptive statistics, pollution exposure variables

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

Variable of exposure Units n Mean ± SD Min. Max.
Night-time noise (Lnight) dB (A) 1706 51.4 ± 5.1 35.7 69.3
NO2 a μg m−3 728 15.6 ± 3.9 8.0 38.6
  1. SD denotes standard deviation.
  2. a Source: Environmental Protection Agency, Ireland