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Table 5 Comparisons of percent changes in PEF 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 −4.51 −5.66, −3.36 −1.91 −3.01, −0.81 0.03*
During exposure 2 h −5.29 −6.44, −3.87 −2.41 −3.84, −0.98 0.02*
Post-exposure 5 h −2.42 −4.17, −0.67 −2.08 −3.62, −0.54 0.08
Post-exposure 7 h −1.63 −3.59, 0.33 −1.76 −3.72, 0.20 0.32
Post-exposure 9 h −3.02 −5.03, −1.02 −2.87 −4.50, −1.24 0.24
Post-exposure 22 h −3.23 −5.23, −1.23 −2.82 −4.73, −0.91 0.36
  1. 95 % CI 95 % confidence intervals
  2. P < 0.05