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Table 2 Propensity score matching before and after data using demographic (sex, age, height, smoking status, and pack-years) information for non-dust-exposed subjects and dust-exposed subjects

From: Quantitative CT-based structural alterations of segmental airways in cement dust-exposed subjects

 Before propensity score matchingAfter propensity score matching (1:4)
NDE subjectsDE subjectsSt.Diff.NDE subjectsDE subjectsSt.Diff.
(N = 255)(N = 63)(N = 164)(N = 41)
N(%)N(%)N(%)N(%)
Sex
 Male99(38.8)45(68.2)61.680(48.8)20(48.8)0.0
 Female156(61.2)21(31.8) 84(51.2)21(51.2) 
Age
 mean ± std51.0±15.170.5±7.5±1.649.7±15.470.0±8.0±1.7
Height
 mean ± std161.4±9.6159.9±10.1±0.2162.9±9.7157.9±11.3±0.5
Smoking
 Non/Former Smoking Participants224(87.8)57(86.4)4.4144(87.8)36(87.8)0.0
 Current Smoking Participants31(12.2)9(13.6) 20(12.2)5(12.2) 
Pack-years
 mean ± std4.6±13.214.7±21.9±0.64.4±12.310.4±22.7±0.3
BMI
 mean ± std24.4±3.324.1±2.80.372*
  1. 19 subjects were excluded by missing values of pack-years in NDE subjects. NDE Non-dust exposed, DE Dust exposed, St. Diff. Standardized differences; *, P-value obtained by one-sample t-test