Table 1

Participants’ characteristics (1995–2014, Bus Santé study, State of Geneva, Switzerland)

All participantsPrimarySecondaryTertiaryP value
Number (N) of participants (%)17 544 (100%)3419 (19.5)7799 (44.5)6326 (36.0)
Mean age±SD, years51.9±10.853.5±11.052.6±10.850.2±10.6<0.001
Swiss nationality, N (%)12 322 (70.4%)1853 (54.3%)6152 (79.1%)4317 (68.4%)<0.001
Gender, N (%)
 Male8398 (47.9%)1307 (38.2%)3968 (50.9%)3123 (49.4%)
 Female9146 (52.1%)2112 (61.8%)3831 (49.1%)3203 (50.6%)
Smoking status, N (%)<0.001
 Never smoker8486 (48.6%)1685 (49.4%)3405 (43.9%)3396 (54.0%)
 Ex-smoker5201 (29.8%)929 (27.3%)2393 (30.8%)1879 (29.9%)
 Current smoker3775 (21.6%)795 (23.3%)1961 (25.3%)1019 (16.2%)
Quit ratio %57.9%53.9%55.0%64.8%<0.001
Mean pack-year units±SD
 Current smokers26.5±19.528.6±19.127.4±20.123.0±17.9<0.001
 Ex-smokers18.1±17.620.4±20.019.0±18.215.7±15.1<0.001
After introduction of smoking ban, N (%)4104 (23.4%)577 (16.9%)1729 (22.2%)1798 (28.4%)<0.001
Year of survey, N (%)<0.001
 1995–19984398 (25.1%)1057 (30.9%)2044 (26.2%)1297 (20.5%)
 1999–20024962 (28.3%)1062 (31.1%)2261 (29.0%)1639 (25.9%)
 2003–20072810 (16.0%)538 (15.7%)1192 (15.3%)1080 (17.1%)
 2008–20113192 (18.2%)428 (12.5%)1446 (18.5%)1318 (20.8%)
 2012–20142182 (12.4%)334 (9.8%)856 (11.0%)992 (15.7%)