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Table 3 Selected characteristics of the study sample by total coffee consumption at baseline, the Norwegian Women and Cancer Study, 1996–2013 - complete case analyses

From: Coffee consumption and the risk of malignant melanoma in the Norwegian Women and Cancer (NOWAC) Study

Characteristics Total coffee consumption
Light consumers Low-moderate consumers High-moderate consumers Heavy consumers
≤1 cup/day >1–3 cups/day >3–5 cups/day >5 cups/day
Age at baseline (y), mean (SD) 47.8 (8.6) 49.0 (8.7) 47.4 (8.2) 46.3 (7.8)
Age at study exit (y), mean (SD) 63.4 (6.8) 64.6 (7.3) 64.1 (6.9) 63.5 (6.5)
Smoking status, %  
 Never 50.8 42.4 31.6 17.1
 Former 31.5 35.9 33.2 26.6
 Current 17.7 21.7 35.2 56.3
Duration of education (y), mean (SD) 13.1 (3.6) 12.5 (3.5) 11.9 (3.3) 11.1 (3.1)
Body mass index, mean (SD) 24.0 (4.2) 24.0 (3.8) 23.9 (3.7) 24.0 (3.9)
Physical activity level, mean (SD) 5.5 (1.9) 5.7 (1.8) 5.7 (1.9) 5.5 (2.0)
Alcohol consumption (g/day), mean (SD) 3.0 (5.5) 3.4 (4.9) 3.3 (4.6) 3.2 (6.9)
Average number of sunburns per year, mean (SD) 0.9 (0.7) 0.8 (0.7) 0.8 (0.7) 0.8 (0.7)
Original hair color, %  
 Dark 17.7 17.1 17.1 17.6
 Brown 38.9 39.6 40.0 40.0
 Blond 40.5 40.2 40.0 39.4
 Ginger 2.9 3.1 2.8 3.0
Number of moles larger than 5 mm, %     
 0 88.3 88.7 88.6 88.8
 1 6.9 6.5 6.7 6.6
 2–3 3.3 3.3 3.3 3.0
 4–6 0.9 0.8 0.9 0.9
 7–12 0.3 0.3 0.3 0.5
 13–24 0.1 0.1 0.2 0.1
 ≥25 0.1 0.1 0.1 0.1
Area of residence, %     
 Oslo area 14.7 10.2 7.2 5.3
 Eastern Norway 39.9 36.2 34.8 30.7
 Southern Norway 5.0 4.6 4.7 4.7
 Western Norway 20.1 23.2 22.3 19.3
 Middle Norway 6.7 7.7 8.2 9.0
 Northern Norway 13.7 18.1 22.8 30.9
  1. y years, SD standard deviation