Table 1– Baseline characteristics of the participants of the Dutch–Belgian Randomised Controlled Lung Cancer Screening Trial (NELSON trial) and the respondents of the subcohort#
Male smokers randomised in the screening armSmoking cessation questionnaire respondents
TotalTest negativesTest indeterminates
Age yrs58.0±4.958.0±5.057.9±5.058.6±4.9
Level of education
 Low1223/2532 (48.3)463/928 (49.9)249/508 (49.0)220/410 (53.7)
 Medium615/2532 (24.3)222/928 (23.9)122/508 (24.0)97/410 (23.7)
 High694/2532 (27.4)227/863 (26.2)137/508 (27.0)93/410 (22.6)
Cigarettes per day
 ≤15673/2576 (26.1)280/948 (29.5)154/519 (29.7)121/419 (28.9)
 16–20701/2576 (27.2)248/948 (26.2)132/519 (25.4)123/419 (29.4)
 21–25696/2576 (27.0)256/948 (27.0)145/519 (27.9)97/419 (23.2)
 >25506/2576 (19.6)164/948 (17.3)88/519 (17.0)78/419 (18.5)
Smoking duration yrs
 ≤35669/2575 (26.0)236/948 (24.9)131/519 (25.2)99/418 (23.7)
 36–40874/2575 (33.9)330/948 (34.8)183/519 (35.3)138/418 (33.0)
 41–45726/2575 (28.2)269/948 (28.4)144/519 (27.7)130/418 (31.1)
 >45306/2575 (11.9)112/948 (11.8)61/519 (11.8)51/418 (12.2)
Smoking exposure pack-yrs
 ≤30766/2575 (29.7)297/948 (31.3)163/519 (31.4)130/418 (31.1)
 31–40729/2575 (28.3)280/948 (29.5)153/519 (29.5)124/418 (29.7)
 41–50586/2575 (22.1)194/948 (20.5)106/519 (20.4)87/418 (20.8)
 51–60277/2575 (10.8)99/948 (10.5)56/519 (10.8)38/418 (9.1)
 >60235/2575 (9.1)77/948 (8.2)41/519 (7.9)39/418 (9.3)
Starting age of smoking yrs
 <15437/2575 (17.0)148/948 (15.6)78/519 (15.0)76/419 (18.1)
 15–201665/2575 (64.7)648/948 (68.4)362/519 (69.7)261/419 (62.3)
 >20473/2575 (18.4)152/948 (16.0)79/519 (15.2)82/419 (15.2)
Time to the first cigarette+ min
 <5484/2442 (19.8)169/898 (18.8)88/492 (17.9)90/395 (22.8)
 5–30983/2442 (40.3)350/898 (39.0)190/492 (38.6)160/395 (40.5)
 30–60617/2442 (25.3)245/898 (27.3)140/492 (28.5)89/395 (22.5)
 >60358/2442 (14.7)134/898 (14.9)74/492 (15.0)56/395 (14.2)
Motivation to quit smoking
 Immotive993/2485 (40.0)374/918 (40.8)208/503 (41.4)154/403 (38.2)
 Pre-contemplator388/2485 (15.6)134/918 (14.6)74/503 (14.7)57/403 (14.1)
 Contemplator759/2485 (30.5)279/918 (39.4)148/503 (29.4)140/403 (34.8)
 Preparator345/2485 (13.9)130/918 (14.2)73/503 (14.5)52/403 (12.9)
  • Data are presented as mean±sd or n/N (%). Test negatives: male smokers who received only negative test results; test indeterminates: male smokers who received at least one indeterminate test result. Low educational level: primary, lower secondary general or lower vocational education; medium educational level: intermediate vocational education or higher secondary education; high educational level: higher vocational education or university. Immotive: no intention to stop smoking within 1 yr or later; pre-contemplator: intention to stop smoking within 6–12 months; contemplator: intention to stop smoking within 1–6 months; preparator: intention to stop smoking within the next month. #: no selection and/or nonresponse bias was found (p>0.05); : data are weighted to correct for the actual distribution of negative and indeterminate screening results in the screening arm; +: first question of the Fagerström Test for Nicotine Dependence.