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Table 4 Stratified analysis of pulmonary function test in female 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 175 (38.6) 12 (26.0) 93.28 (1.47) 87.17 (4.03) 0.159 92.20 (1.02) 84.81 (3.53) 0.047 0.79 (0.006) 0.81 (0.019) 0.270
 High 234 (61.4) 30 (74.0) 92.37 (0.93) 94.44 (3.46) 0.564 93.43 (0.99) 98.60 (1.93) 0.019 0.83 (0.005) 0.81 (0.018) 0.419
Household income
 Low 162 (37.8) 12 (27.5) 91.15 (1.53) 85.24 (2.81) 0.068 90.87 (1.17) 83.97 (2.17) 0.006 0.80 (0.006) 0.83 (0.021) 0.172
 High 247 (62.2) 30 (72.5) 93.64 (0.97) 95.91 (4.11) 0.593 94.24 (0.91) 100.02 (2.06) 0.012 0.82 (0.006) 0.80 (0.017) 0.346
Occupational class
 Blue collar 123 (28.2) 8 (20.1) 91.60 (1.65) 85.70 (3.89) 0.448 91.86 (1.43) 84.44 (2.54) 0.308 0.80 (0.006) 0.80 (0.017) 0.773
 White collar 286 (71.8) 34 (79.9) 93.14 (0.95) 94.20 (3.56) 0.774 93.41 (0.81) 97.51 (1.84) 0.044 0.82 (0.005) 0.82 (0.014) 0.740
Smoking status
 Smoker 29 (7.8) 1 (1.7) 90.31 (2.39) 97.45 (0) 0.800 90.98 (2.18) 114.60 (0) 0.133 0.83 (0.010) 0.73 (0) 0.133
 Non-smoker 380 (92.2) 41 (98.3) 92.97 (0.88) 92.33 (2.72) 0.822 93.19 (0.77) 94.35 (1.59) 0.515 0.81 (0.005) 0.81 (0.012) 0.806
Drinking status
 Heavy 43 (11.8) 11 (28.2) 91.38 (1.93) 93.34 (0.99) 0.368 92.85 (1.55) 98.28 (0.84) 0.003 0.83 (0.018) 0.80 (0.011) 0.231
 Social 366 (88.2) 31 (71.8) 92.88 (0.87) 92.02 (3.49) 0.812 92.99 (0.70) 93.17 (2.27) 0.940 0.81 (0.004) 0.82 (0.015) 0.654
Age (years)
 Young (19–38) 64 (19.4) 13 (35.0) 91.77 (1.28) 93.61 (2.54) 0.521 93.12 (1.30) 98.40 (3.01) 0.111 0.85 (0.008) 0.82 (0.020) 0.127
 Middle (39–58) 232 (58.8) 22 (48.2) 92.06 (1.01) 91.10 (5.24) 0.858 93.72 (1.04) 92.44 (4.85) 0.797 0.81 (0.005) 0.81 (0.012) 0.728
 Old (> 58) 113 (21.7) 7 (16.8) 95.32 (1.86) 91.95 (5.65) 0.436 91.13 (1.26) 86.36 (7.57) 0.430 0.78 (0.008) 0.78 (0.009) 0.906
  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