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Table 2 The results of pulmonary function test and the number for categorization of lung disease of subjects according to city of residence

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

Variables Pulmonary function tests - Mean (Standard error) Categorization of lung disease - N (%)
FEV1p FVCp FEV1/FVC Normala Obstructionb Restrictionc
Total
 Seoul 91.45 (0.61) 92.10 (0.56) 0.80 (0.004) 587 (81.01) 68 (7.41) 94 (11.58)
 Jeju 94.81 (1.74) 95.58 (0.96) 0.82 (0.008) 69 (86.64) 5 (3.51) 7 (9.85)
p value 0.071 0.002 0.167 0.258
Male
 Seoul 90.24 (0.73) 91.26 (0.68) 0.79 (0.005) 236 (76.52) 51 (10.60) 53 (12.88)
 Jeju 97.23 (1.19) 96.37 (1.41) 0.82 (0.005) 34 (94.74) 4 (4.29) 1 (0.97)
p value < 0.001 0.001 0.001 0.001
Female
 Seoul 92.71 (0.82) 92.97 (0.67) 0.81 (0.004) 351 (85.63) 17 (4.12) 41 (10.25)
 Jeju 92.44 (2.56) 94.81 (1.28) 0.81 (0.013) 35 (78.71) 1 (2.74) 6 (18.54)
p value 0.922 0.208 0.971 0.229
  1. p value were calculated by T-test to compare Seoul with Jeju, or chi-square test to compare categorization of lung disease
  2. FEV1p predicted values of forced expiratory volume in 1 s, FVCp predicted values of forced vital capacity, FEV1/FVC FEV1/FVC ratio
  3. aNormal included subjects who had either an FEV1/FVC ≥0.70 and FVCp ≥80%
  4. bObstruction included subjects with FEV1/FVC < 0.70
  5. cRestriction included subjects who had either an FEV1/FVC ≥0.70 and FVCp < 80%