Table 1 Baseline characteristics of ATBC Study participants initiating smoking at ≤ 20 years

All participants

Age (years)

50–54

55–59

60–64

65–69

Cigarettes per day at baseline

5–19

20–29

≥ 30

BMI (kg/m²) *

≤ 19

20–24

25–29

≥ 30

Education (years at school)

≤ 6

7–9

≥ 10

Residential neighborhood during the last 20 years *

City (> 50,000 inhab.)

Town

Village

Countryside