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

From: Vitamin E supplementation and pneumonia risk in males who initiated smoking at an early age: effect modification by body weight and dietary vitamin C

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