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Table 2 Potential effect modifiers of traffic-concentration relationship

From: Land use regression modeling of intra-urban residential variability in multiple traffic-related air pollutants

Home characteristics: Obstructed from road Yes/no
  Obstructed from major road Yes/no
Sampling period characteristics: Percent of hours downwind from major road Percent (%)
  Average windspeed during daytime sampling hours (6am–9pm) m/s
  Percent daytime hours with still winds (< 2 m/s) Percent (%)
  Percent of weekend sampling days Percent (%)
  Floor (monitor height) (Categorical: 1, 2, 3+)
  Snow during sampling period Yes/no