Table 1

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

Characteristic
Number of participants

All participants
21657
Age (years)

50–54
7778
55–59
6908
60–64
5058
65–69
1913
Cigarettes per day at baseline

5–19
7295
20–29
10259
≥ 30
4103
BMI (kg/m2) *

≤ 19
700
20–24
7781
25–29
9902
≥ 30
3260
Education (years at school)

≤ 6
17253
7–9
2956
≥ 10
1448
Residential neighborhood during the last 20 years *

City (> 50,000 inhab.)
9305
Town
4667
Village
3160
Countryside
4519

* BMI was missing for 14 and residential neighborhood for 6 participants.

Hemilä and Kaprio Nutrition Journal 2008 7:33   doi:10.1186/1475-2891-7-33