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Table 4 Comparisons of percent changes in FEV1 during and post-exposure in the transport hub and the park

From: Acute effects on pulmonary function in young healthy adults exposed to traffic-related air pollution in semi-closed transport hub in Beijing

Time points Transport hub Park P value
Mean 95 % CI Mean 95 % CI
During exposure 1 h −3.48 −4.43, −2.53 −0.32 −1.28, 0.64 0.01*
During exposure 2 h −4.43 −5.47, −3.39 −1.59 −2.68, −0.50 0.04*
Post-exposure 5 h −2.53 −3.93, −1.13 −2.28 −3.90, −0.66 0.13
Post-exposure 7 h −2.22 −3.56, −0.88 −1.96 −3.68, −0.24 0.37
Post-exposure 9 h −1.11 −2.41, 0.21 −1.28 −2.85, 0.29 0.67
Post-exposure 22 h −2.21 −4.25, −0.17 −1.64 −3.55, 0.27 0.21
  1. 95 % CI 95 % confidence intervals
  2. P < 0.05