Table 1. Comparison between the included subsample of participants and the total cohort of screening participants in the study period between July 2007–September 2008.
| Study populationa | All screening participantsb | ||
| (N = 266) | (N = 1,741) | ||
| Age in years | |||
| Mean ± SD | 62.5±5.0 | 62.6±5.4 | |
| CT emphysema (%) | |||
| Mean ± SD | 1.74±3.34 | 1.67±3.01 | |
| Median [P25–P75] | 0.78 [0.40–1.58] | 0.76 [0.39–1.49] | |
| CT air trapping (%) | |||
| Mean ± SD | 84.4±5.9 | 84.1±6.5 | |
| Median [P25–P75] | 84.9 [80.9–88.4] | 84.7 [80.2–88.3] |
Comparison using Mann-Whitney U test revealed no significant differences between the two groups.
a
data in the randomly selected subsample of male participants;
b
data in the total group of male participants screened in the study period