Table 1

Characteristics for the 122 nonsmoking cases of lung cancer and the 121 controls

CharacteristicsCases n (%)Controls n (%)
Gender
Men17 (13.9)34 (28.1)
Women105 (86.1)87 (71.9)
Age
Minimum–4919 (15.6)26 (21.5)
50–5926 (21.3)34 (28.1)
60–6926 (21.3)36 (29.8)
70–maximum51 (41.8)25 (20.7)
Educational level
<secondary16 (25.0)29 (31.2)
Some secondary27 (42.2)21 (22.6)
Secondary completed12 (18.7)14 (15.0)
>secondary9 (14.1)29 (31.2)
Missing5828
Exposure to environmental tobacco smoke from
Spouse
Never64 (52.5)79 (65.3)
Ever58 (47.5)42 (34.7)
1–119 h/day41 (35.0)27 (23.5)
>119 h/day12 (10.3)9 (7.8)
Missinga56
Spouse or workplace
Never32 (26.2)37 (30.6)
Ever90 (73.8)84 (69.4)
1–104 h/day65 (55.5)53 (49.1)
>104 h/day20 (17.1)18 (16.7)
Missinga513
Occasional smokers
Never82 (68.9)91 (78.3)
Ever37 (31.1)26 (21.7)
1–4.2 packs20 (17.0)12 (10.3)
>4.2 packs16 (13.6)11 (9.4)
Missinga34
Exposure to known or suspected occupational carcinogens
Never105 (86.1)105 (89.7)
Ever17 (13.9)16 (9.3)
Residence
Rural (>75% lifetime)42 (35.6)24 (20.7)
Mixed rural and urban44 (37.3)38 (32.8)
Urban (>75% lifetime)32 (27.1)54 (46.6)
Missing45
Indoor pollution from
Wood (>20 yr)47 (38.8)27 (22.3)
Coal (>17 yr)11 (9.1)22 (18.2)
  • a Missing data refers to quantitative variables. h/day, hours/day times years.