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Fig. 5 —Bar graph shows lung density differences between abnormal and normal areas in air trapping and no-air trapping groups. Lung density differences were significantly larger at expiration (gray bars) (mean ± SD, 260 ± 77 H) than at inspiration (black bars) (129 ± 69 H) in air trapping group (star, p < 0.001), whereas there was no significant difference in no-air trapping group (207 ± 105 H at inspiration, 213 ± 186 H at expiration) (p > 0.05).