Table 1.

Selected characteristics of skin SCC cases and controls

VariableControls, n (%)Cases, n (%)P*
Gender
    Females132 (41)129 (38)0.475
    Males189 (59)207 (62)
Age group (y)
    <4950 (16)30 (9)0.035
    50-5938 (12)38 (11)
    60-69113 (35)110 (33)
    70-7994 (29)129 (38)
    >7926 (8)29 (9)
Education
    <High school27 (8)30 (9)0.965
    High school83 (26)85 (25)
    Some college or higher210 (65)221 (66)
Smoking
    Never116 (36)112 (33)0.050
    Former146 (45)181 (54)
    Current59 (18)43 (13)
Actinic keratosis history
    No227 (71)85 (25)<0.001
    Yes94 (29)251 (75)
Freckles number on arm
    None24 (7)5 (1)<0.001
    <50270 (84)263 (78)
    ≥5027 (8)68 (20)
Tanning ability
    Never2 (1)14 (4)<0.001
    Mild50 (16)86 (26)
    Moderate173 (54)188 (56)
    Deep94 (29)48 (14)
Reaction of skin to first sun exposure
    Always burn18 (5.6)31 (9.2)<0.001
    Usually burn46 (14.4)67 (19.9)
    Moderate burn101 (31.7)137 (40.8)
    Minimal burn105 (32.9)75 (22.3)
    Rarely/never burn49 (15.4)26 (7.7)
Current use of NSAIDs31 (9.2)35 (10.9)0.746
  • * P of comparison in factors between cases and controls.