Table 2.

Hazard Ratios for the Risk of Adult Malignant Melanoma per Increment of Body Mass Index or Body Surface Area z Score in Childhood, by Age, Copenhagen, Denmark, 1968–2012^a

Age, years	No. of Childrenb	No. of Casesb	Body Mass Indexc				Body Surface Aread
			Unadjusted		Height-Adjustede		Unadjusted		Height-Adjustede
			HR	95% CI	HR	95% CI	HR	95% CI	HR	95% CI
7	299,891	2,194	1.04	1.00, 1.09	1.01	0.96, 1.05	1.19	1.14, 1.24	1.02	0.93, 1.11
8	303,519	2,227	1.05	1.00, 1.10	1.00	0.96, 1.05	1.20	1.15, 1.25	1.01	0.93, 1.10
9	292,652	2,207	1.05	1.00, 1.10	0.99	0.95, 1.04	1.19	1.14, 1.25	0.99	0.91, 1.08
10	285,093	2,176	1.04	1.00, 1.09	0.99	0.94, 1.04	1.18	1.13, 1.24	0.98	0.91, 1.07
11	283,049	2,178	1.03	0.98, 1.08	0.97	0.93, 1.02	1.17	1.12, 1.22	0.96	0.88, 1.04
12	280,523	2,164	1.03	0.98, 1.08	0.97	0.92, 1.02	1.16	1.11, 1.21	0.95	0.87, 1.03
13	276,020	2,144	1.01	0.97, 1.06	0.96	0.91, 1.00	1.14	1.09, 1.19	0.93	0.86, 1.00

Abbreviations: CI, confidence interval; HR, hazard ratio.

^a Based on data from the Copenhagen School Health Records Register. All analyses were stratified by sex and 5-year birth cohort.

^b Numbers of individuals at each age may vary from the total, as not every child had anthropometric values at each age.

^c Body mass index was defined as weight (kg)/height (m)².

^d Body surface area was defined as weight (kg)^0.5378 × height (cm)^0.3964 × 0.024265.

^e Adjusted for childhood height.