Table 1

Characteristics of the study populationa

NAC groupPlacebo group
Number2120
Sex (male/female)6/158/12
Age42 ± 2.344 ± 1.9
Cigarettes/day24.8 ± 2.028.5 ± 3.1
Tar/day (mg)335.0 ± 46.1417.4 ± 56.9
Nicotine/day (mg)29.3 ± 5.036.9 ± 6.1
Smoking years25 ± 1.827 ± 1.8
Pack years31.9 ± 3.739.8 ± 5.8
  • a Results are expressed as mean ± SE.