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Table 3 Stratified analysis of pulmonary function test in male subjects according to general characteristics

From: A cross-sectional study on the pulmonary function of residents in two urban areas with different PM10 concentrations: data from the fourth Korea national health and nutrition examination survey (KNHANES) 2007–2009

  N (%) FEV1p - Mean (Standard error) FVCp - Mean (Standard error) FEV1/FVC - (Standard error)
Seoul Jeju Seoul Jeju p-value Seoul Jeju p-value Seoul Jeju p-value
Education level
 Low 89 (22.4) 3 (5.7) 88.05 (1.89) 92.71 (5.93) 0.632 89.95 (1.58) 96.40 (2.56) 0.296 0.74 (0.011) 0.75 (0.052) 0.602
 High 251 (77.6) 36 (94.3) 90.81 (0.76) 97.44 (0.67) < 0.001 91.60 (0.72) 96.37 (1.08) < 0.001 0.81 (0.005) 0.82 (0.003) 0.021
Household income
 Low 116 (32.3) 4 (6.3) 89.33 (1.17) 95.59 (1.76) 0.474 90.93 (1.11) 83.90 (1.49) 0.357 0.78 (0.006) 0.83 (0.044) 0.861
 High 224 (67.7) 35 (93.7) 90.68 (0.91) 97.38 (0.98) < 0.001 91.42 (0.84) 97.52 (1.26) < 0.001 0.80 (0.007) 0.82 (0.006) 0.100
Occupational class
 Blue collar 118 (33.1) 8 (22.1) 88.44 (1.49) 90.36 (1.83) 0.689 90.86 (1.22) 90.55 (2.77) 0.589 0.77 (0.010) 0.80 (0.017) 0.484
 White collar 222 (66.9) 31 (77.9) 91.11 (0.79) 99.01 (1.40) < 0.001 91.45 (0.77) 97.88 (1.44) < 0.001 0.80 (0.006) 0.82 (0.003) 0.002
Smoking status
 Smoker 275 (80.2) 30 (78.4) 89.80 (0.89) 97.95 (1.15) < 0.001 91.22 (0.78) 96.07 (2.44) 0.062 0.79 (0.005) 0.83 (0.006) < 0.001
 Non-smoker 65 (19.8) 9 (21.6) 91.70 (1.37) 93.60 (6.10) 0.901 91.38 (1.36) 97.91 (8.92) 0.722 0.82 (0.013) 0.76 (0.021) 0.070
Drinking status
 Heavy 141 (42.4) 19 (46.0) 90.60 (1.10) 99.43 (2.94) 0.006 92.06 (1.11) 100.88 (3.37) 0.015 0.79 (0.008) 0.81 (0.023) 0.279
 Social 199 (57.6) 20 (54.0) 89.98 (0.90) 95.70 (1.75) 0.005 90.68 (0.74) 93.22 (1.66) 0.166 0.80 (0.007) 0.82 (0.007) 0.019
Age (years)
 Young (19–38) 75 (28.7) 7 (25.3) 93.35 (0.99) 99.22 (1.56) 0.993 94.24 (0.91) 98.21 (3.32) 0.523 0.84 (0.007) 0.85 (0.007) 0.993
 Middle (39–58) 158 (50.4) 21 (59.3) 88.36 (1.11) 96.48 (1.77) < 0.001 90.88 (0.92) 97.34 (1.12) < 0.001 0.78 (0.006) 0.81 (0.007) 0.002
 Old (> 58) 107 (20.9) 11 (15.4) 89.14 (1.34) 95.21 (1.12) 0.001 86.88 (1.50) 89.88 (2.81) 0.350 0.74 (0.010) 0.78 (0.037) 0.289
  1. p-value were calculated by T-test or Mann-Whitney test to compare Seoul with Jeju
  2. FEV1p predicted values of forced expiratory volume in 1 s, FVCp predicted values of forced vital capacity, FEV1/FVC FEV1/FVC ratio