Childhood body mass index and multiple sclerosis risk: a long-term cohort study

TY - JOUR

T1 - Childhood body mass index and multiple sclerosis risk

T2 - a long-term cohort study

AU - Munger, Kassandra L

AU - Bentzen, Joan

AU - Laursen, Bjarne

AU - Stenager, Egon

AU - Koch-Henriksen, Nils Iørgen

AU - Sørensen, Thorkild I A

AU - Baker, Jennifer Lyn

PY - 2013/9

Y1 - 2013/9

N2 - Background: Obesity in late adolescence has been associated with an increased risk of multiple sclerosis (MS); however, it is not known if body size in childhood is associated with MS risk. Methods: Using a prospective design we examined whether body mass index (BMI) at ages 7-13 years was associated with MS risk among 302,043 individuals in the Copenhagen School Health Records Register (CSHRR). Linking the CSHRR with the Danish MS registry yielded 774 MS cases (501 girls, 273 boys). We used Cox proportional hazards models to estimate the hazard ratios (HRs) and 95% confidence intervals (CIs). Results: Among girls, at each age 7-13 years, a one-unit increase in BMI z-score was associated with an increased risk of MS (HRage 7=1.20, 95% CI: 1.10-1.30; HRage 13=1.18, 95% CI: 1.08-1.28). Girls who were ≤95th percentile for BMI had a 1.61-1.95-fold increased risk of MS as compared to girls <85th percentile. The associations were attenuated in boys. The pooled HR for a one-unit increase in BMI z-score at age 7 years was 1.17 (95% CI: 1.09-1.26) and at age 13 years was 1.15 (95% CI: 1.07-1.24). Conclusion: Having a high BMI in early life is a risk factor for MS, but the mechanisms underlying the association remain to be elucidated.

AB - Background: Obesity in late adolescence has been associated with an increased risk of multiple sclerosis (MS); however, it is not known if body size in childhood is associated with MS risk. Methods: Using a prospective design we examined whether body mass index (BMI) at ages 7-13 years was associated with MS risk among 302,043 individuals in the Copenhagen School Health Records Register (CSHRR). Linking the CSHRR with the Danish MS registry yielded 774 MS cases (501 girls, 273 boys). We used Cox proportional hazards models to estimate the hazard ratios (HRs) and 95% confidence intervals (CIs). Results: Among girls, at each age 7-13 years, a one-unit increase in BMI z-score was associated with an increased risk of MS (HRage 7=1.20, 95% CI: 1.10-1.30; HRage 13=1.18, 95% CI: 1.08-1.28). Girls who were ≤95th percentile for BMI had a 1.61-1.95-fold increased risk of MS as compared to girls <85th percentile. The associations were attenuated in boys. The pooled HR for a one-unit increase in BMI z-score at age 7 years was 1.17 (95% CI: 1.09-1.26) and at age 13 years was 1.15 (95% CI: 1.07-1.24). Conclusion: Having a high BMI in early life is a risk factor for MS, but the mechanisms underlying the association remain to be elucidated.

U2 - 10.1177/1352458513483889

DO - 10.1177/1352458513483889

M3 - Journal article

SN - 1352-4585

VL - 19

SP - 1323

EP - 1329

JO - Multiple Sclerosis Journal

JF - Multiple Sclerosis Journal

IS - 10

ER -