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Table 3 Adjusted estimates for percent predicted FEV1 and FVC associated with education level stratified by age category

From: Socioeconomic status is associated with reduced lung function in China: an analysis from a large cross-sectional study in Shanghai

   FEV1 % Predicteda FVC % Predicteda
   Estimate (95 % CI) P-value Estimate (95 % CI) P-value
Age < 40 Low −0.82 (−2.01, 0.37) 0.18 −1.34 (−2.58, −0.10) 0.03
  Intermediate −0.58 (–1.25, 0.09) 0.09 −0.77 (−1.47, −0.08) 0.03
  High Reference . Reference .
  Trend test p-value   0.08   0.01
Age 40 – 64 Low −1.85 (−3.05, −0.66) <0.01 −2.23 (−3.39, −1.08) <0.01
  Intermediate −0.64 (−1.77, 0.49) 0.27 −0.81 (−1.91, 0.28) 0.14
  High Reference . Reference .
  Trend test p-value   <0.01   <0.01
Age ≥ 65 Low −4.76 (−7.33, −2.20) <0.01 −5.50 (−7.60, −3.40) <0.01
  Intermediate −1.65 (−4.39, 1.09) 0.24 −1.42 (−3.67, 0.82) 0.21
  High Reference . Reference .
  Trend test p-value   <0.01   <0.01
  1. aAdjusted for SHS exposure (yes or no), smoking history (current, former, and never), pack years of smoking, biomass exposure (yes or no), low fruit/vegetable diet (<1/day serving of either fruits or vegetables), mode of transport to work, and occupational category