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Table 1 Characteristics of lung cancer (LC) cases diagnosed between July 1, 1997 and December 31, 2006 in screening participants, invitation-to-screening group and control group [26]

From: Is chest X-ray screening for lung cancer in smokers cost-effective? Evidence from a population-based study in Italy

Variable Screening participants (67 LC cases) Invitation-to-screening group (245 LC cases) Control group (156 LC cases)
Age, median (IQR) 66 (60–72) 68 (60–73) 68 (62–73)
Gender M/F 60/7 221/24 144/12
Smoking habit, n (%)a,b
 Ex smokers 16 (24) 60 (25) 77 (49)
 Smokers 50 (76) 180 (75) 79 (51)
LC stage at diagnosis, n (%)
 I 21 (32) 49 (21) 23 (15)
 II 3 (5) 13 (6) 9 (6)
 III/IV 41 (63) 166 (73) 122 (79)
 Indeterminate/not available 2 17 2
 LC cases with censored follow-up*, n (%) 21 (31 %) 57 (23 %) 12 (8 %)
 LC follow-up months*, median (IQR) 14.03 (30.82) 11.89 (22.54) 8.20 (15.82)
  1. IQR interquartile range, CI confidence interval
  2. * Expressed as months from LC diagnosis until death, or until the end of observational period (December 31, 2006)
  3. aNot available in 1 screening participant
  4. bNot available in 5 subjects of invitation-to-screening group