Table 4.

Comparison of the complete-case dataset and the dataset with imputed values (multiple imputation), the Norwegian Women and Cancer Study, 1996–2013

Characteristics	Missing, N(%)	Complete-case	Multiple imputation
Total coffee consumption-baseline, mean (SD)	0 (0.0)	3.9 (2.5)	3.9 (2.5)
Total coffee consumption-follow-up, mean (SD)	21,011 (22.9)	3.4 (2.2)	3.4 (2.2)
Filtered coffee consumption-baseline, mean (SD)	0 (0.0)	2.6 (2.4)	2.6 (2.4)
Filtered coffee consumption-follow-up, mean (SD)	27,953 (30.5)	2.5 (2.2)	2.5 (2.2)
Instant coffee consumption-baseline, mean (SD)	0 (0.0)	0.3 (1.1)	0.3 (1.1)
Instant coffee consumption-follow-up, mean (SD)	27,953 (30.5)	0.4 (1.0)	0.4 (1.0)
Boiled coffee consumption-baseline, mean (SD)	0 (0.0)	0.9 (2.0)	0.9 (2.0)
Boiled coffee consumption-follow-up, mean (SD)	27,953 (30.5)	0.5 (1.4)	0.5 (1.4)
Smoking status, %
Never	1595 (1.5)	34.6	34.7
Former		32.2	32.2
Current		33.1	33.1
Duration of education (y), mean (SD)	5184 (5.0)	12.1 (3.4)	12.0 (3.4)
Body mass index, mean (SD)	2379 (2.3)	24.0 (3.8)	24.0 (3.8)
Physical activity level, mean (SD)	9560 (9.2)	5.6 (1.9)	5.6 (1.9)
Alcohol consumption (g/day), mean (SD)	1686 (1.6)	3.2 (5.4)	3.2 (5.4)
Average number of sunburns per year, mean (SD)	11,103 (10.7)	0.8 (0.7)	0.8 (0.7)
Original hair color, %
Dark	1587 (1.5)	17.3	17.3
Brown		39.7	39.6
Blond		40.0	40.1
Ginger		3.0	3.0
Number of moles larger than 5 mm, %
0	10,444 (10.0)	88.6	88.7
1		6.6	6.6
2–3		3.2	3.2
4–6		0.9	0.9
7–12		0.4	0.4
13–24		0.1	0.1
≥25		0.1	0.1
Area of residence	0 (0.0)
Oslo area		8.9	8.9
Eastern Norway		35.1	35.1
Southern Norway		4.7	4.7
Western Norway		21.5	21.5
Middle Norway		8.0	8.0
Northern Norway		21.8	21.8

y years, SD standard deviation