Table 1 Daily and average level associations between air pollutants NO₂ and CO predicting adolescents′ fatigue and distress, using three level hierarchical linear regression models that nested days within years within individuals. Weekday was coded 1 = weekday 2 = not a weekday.

Weekday

0.056^a

0.053^a

0.073^a

0.073^a

0.071^a

0.071^a

0.076^a

0.077^a

(0.015)

(0.015)

(0.015)

(0.015)

(0.011)

(0.011)

(0.010)

(0.010)

Person Mean-Centered Daily Pollutant level

0.004^a

0.004^a

0.006

0.006

0.001^c

0.001^c

0.004

0.004

(0.001)

(0.001)

(0.003)

(0.003)

(0.001)

(0.001)

(0.002)

(0.002)

Person Average Pollutant Level

0.009^c

0.007

0.021^c

0.014

0.004

0.003

0.012

0.007

(0.004)

(0.004)

(0.010)

(0.009)

(0.004)

(0.003)

(0.008)

(0.008)

Physical Symptoms Each Year

0.231^a

0.231^a

0.164^a

0.163^a

(0.023)

(0.023)

(0.020)

(0.020)

Daily Pollutant level × Physical Symptoms

0.003^a

0.009^b

0.002^b

0.006^b

(0.001)

(0.003)

(0.001)

(0.002)

Constant

1.444^a

1.515^a

1.563^a

1.608^a

1.340^a

1.388^a

1.390^a

1.421^a

(0.127)

(0.115)

(0.070)

(0.064)

(0.108)

(0.101)

(0.059)

(0.055)