Table 1 Demographic and lifestyle characteristics of study participants at 31/12/2013

Sex

Male

330 (26.4%)

Female

920 (73.6%)

Age

Years (mean ± SD)

51.9 ± 13.6

Education

Primary school or less

105 (8.4%)

Secondary school

325 (26.0%)

High school

493 (39.4%)

University

188 (15.0%)

Others

87 (7.0%)

Missing

52 (4.2%)

Occupation

Employee

714 (57.1%)

Unemployed

102 (8.2%)

Pensioner

304 (24.3%)

Housewife

93 (7.4%)

Missing

37 (3.0%)

Ethnicity

White

1198(95.8%)

Black

11 (0.9%)

Asian

3 (0.3%)

South America

38 (3.0%)

Year of enrollment

2010

129 (10.3%)

2011

419 (33.5%)

2012

385 (30.8%)

2013

317 (25.4%)

Season of enrollment

Winter

320 (25.6%)

Spring

313 (25.0%)

Summer

190 (15.2%)

Autumn

427 (34.2%)

Smoking

Never

599 (47.9%)

Former

431 (34.5%)

Current

190 (15.2%)

Missing

30 (2.4%)

Cigarettes smoked* [cigarettes/day]

<= 5

53 (27.9%)

5-10

53 (27.9%)

10-15

33 (17.4%)

15-20

37 (19.6%)

20-40

13 (6.8%)

Missing

1 (0.5%)

Time since quitting (n = 419)

Median [Q1, Q3]

13.1 [5.8–23.4]

Pack/years (n = 1153)

Median [Q1, Q3]

Among current and former smokers

14.5 [6.1–28.0]

Including nonsmokers

0 [0–13.5]

Alcohol consumption

Yes

636 (50.9%)

No

518 (41.4%)

Missing

96 (7.7%)

Residence area

City

534 (42.7%)

Peripheral area

331 (26.5%)

Rural area

30 (2.4%)

Village/small city

206 (16.5%)

Missing

149 (11.9%)

Living area

Province of Milan (Excluding City of Milan)

379 (30.3%)

City of Milan

713 (57.0%)

Outside Milan

158 (12.7%)

Work area

Province of Milan (Excluding City of Milan)

94 (13.1%)

City of Milan

339 (47.5%)

Outside Milan

34 (4.8%)

Missing

247 (34.6%)

Floor of residence

Ground floor

223 (17.8%)

First floor

244 (19.5%)

Second floor

156 (12.5%)

Beyond second floor

471 (37.7%)

Missing

156 (12.5.%)

Residence traffic exposure

Mild

108 (8.7%)

Moderate

595 (47.6%)

Heavy

369 (29.5%)

Missing

178 (14.2%)