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. Author manuscript; available in PMC: 2012 Nov 1.
Published in final edited form as: J Invest Dermatol. 2012 Feb 16;132(5):1354–1362. doi: 10.1038/jid.2012.4

Table 1.

Characteristics of NMSC cases and matched1 controls, Washington County, MD.

Characteristic NMSC cases
% (n = 900)		 Controls
% (n = 900)		 P2
Age at baseline3
    Mean +/− SD
    ≤34
    35–44
    45–54
    55–64
    65–74
    ≥75
59.7 +/− 13.0
4.4
9.4
18.4
27.7
27.6
12.4
56.6 +/− 13.1
5.9
13.8
19.7
31.0
24.0
5.7

<0.01
Gender
    Male
    Female
46.3
53.7
46.3
53.7
1.0
Education3
    Mean +/− SD
    <12 years
    12 years
    >12 years
12.1 +/− 3.0
27.9
41.7
30.4
12.4 +/− 2.9
26.0
41.1
32.9

0.48
Body Mass Index3
    Mean +/− SD
    <18.5
    18.5 – 24.9
    25.0 – 29.9
    ≥30.0
25.9 +/− 4.3
1.3
42.9
41.0
14.8
26.2 +/− 4.6
0.8
41.8
40.2
17.2

0.36
Cigarette Smoking†
    Never
    Former
    Current
51.1
35.0
13.9
43.0
30.7
26.3
<0.01
Skin Type4
    Blistering burn
    Burn without blisters
    Burn that tans
    Tan without burn
    No change
    Missing
14.5
34.0
38.0
10.2
3.3
(n = 479)
14.5
31.6
40.4
10.9
2.6
(n = 479)
0.89
Basal Cell Carcinoma
    1
    >1
Squamous Cell Carcinoma
    1
    >1
65.5
34.5

61.2
38.8
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1

Controls were matched on age (+/− 5 years, +/− 10 years for those ≥75), gender, and skin type. 13 cases were matched to controls with skin type off by one category.

2

Chi Squared test

3

Measured at baseline in 1989

4

Measured in 2003 and 2007