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Table 6 Percent changes in FEV1 and PEF associated with per incremental increases in inhaled doses

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 FEV1 (%) PEF (%)
PM2.5 BC CO PM2.5 BC CO
During exposure 1 h −0.11 (−0.21, −0.01)* −0.14 (−0.25, −0.02)* −0.07 (−0.13, −0.01)* −0.08 (−0.18, 0.02) −0.15 (−0.27, −0.03)* −0.06 (−0.12, 0.01)
During exposure 2 h −0.23 (−0.36, −0.10)* −0.23 (−0.38, −0.08)* −0.16 (−0.24, −0.07)* −0.14 (−0.28, −0.01)* −0.23 (−0.38, −0.08)* −0.12 (−0.21, −0.03)*
Post-exposure 5 h 0.13 (−0.02, 0.30) 0.07 (−0.13, 0.26) 0.07 (−0.04, 0.17) −0.01 (−0.18, 0.17) −0.09 (−0.30, 0.12) 0.07 (−0.04, 0.17)
Post-exposure 7 h 0.10 (−0.07, 0.27) 0.07 (−0.12, 0.27) 0.11 (−0.02, 0.23) −0.11 (−0.32, 0.10) −0.15 (−0.40, 0.11) 0.03 (−0.11, 0.17)
Post-exposure 9 h 0.03 (−0.13, 0.18) −0.08 (−0.26, 0.10) 0.04 (−0.06, 0.14) 0.01 (−0.18, 0.19) −0.05 (−0.28, 0.17) 0.09 (−0.03, 0.21)
Post-exposure 22 h 0.01 (−0.20, 0.21) −0.11 (−0.35, 0.13) 0.02 (−0.11, 0.16) 0.03 (−0.16, 0.22) −0.01 (−0.24, 0.22) 0.10 (−0.02, 0.22)
  1. Percent changes and 95 % CIs were both presented. Increases inhaled doses for each pollutant were PM2.5: per 10 μg/m2; BC, per 1 μg/m2; CO, per 0.1 mg/m2
  2. P < 0.05