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Author  |
Kvamme, J.-M.; Holmen, J.; Wilsgaard, T.; Florholmen, J.; Midthjell, K.; Jacobsen, B.K. |
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Title |
Body mass index and mortality in elderly men and women: the Tromso and HUNT studies |
Type |
Journal Article |
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Year |
2012 |
Publication |
Journal of Epidemiology and Community Health |
Abbreviated Journal |
J Epidemiol Community Health |
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Volume |
66 |
Issue |
7 |
Pages |
611-617 |
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Keywords |
Aged; Aged, 80 and over; *Body Mass Index; Female; Humans; Male; Mortality/*trends; Norway/epidemiology; Proportional Hazards Models; Questionnaires; Registries |
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Abstract |
BACKGROUND: The impact of body mass index (BMI; kg/m(2)) and waist circumference (WC) on mortality in elderly individuals is controversial and previous research has largely focused on obesity. METHODS: With special attention to the lower BMI categories, associations between BMI and both total and cause-specific mortality were explored in 7604 men and 9107 women aged >/= 65 years who participated in the Tromso Study (1994-1995) or the North-Trondelag Health Study (1995-1997). A Cox proportional hazards model adjusted for age, marital status, education and smoking was used to estimate HRs for mortality in different BMI categories using the BMI range of 25-27.5 as a reference. The impact of each 2.5 kg/m(2) difference in BMI on mortality in individuals with BMI < 25.0 and BMI >/= 25.0 was also explored. Furthermore, the relations between WC and mortality were assessed. RESULTS: We identified 7474 deaths during a mean follow-up of 9.3 years. The lowest mortality was found in the BMI range 25-29.9 and 25-32.4 in men and women, respectively. Mortality was increased in all BMI categories below 25 and was moderately increased in obese individuals. U-shaped relationships were also found between WC and total mortality. About 40% of the excess mortality in the lower BMI range in men was explained by mortality from respiratory diseases. CONCLUSIONS: BMI below 25 in elderly men and women was associated with increased mortality. A modest increase in mortality was found with increasing BMI among obese men and women. Overweight individuals (BMI 25-29.9) had the lowest mortality. |
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Address |
Department of Community Medicine, Faculty of Health Sciences, University of Tromso, N-9037 Tromso, Norway. jan-magnus.kvamme@uit.no |
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Language |
English |
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Series Volume |
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Edition |
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ISSN |
0143-005X |
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Notes |
PMID:21321065; PMC3368492 |
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no |
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Call Number |
HUNT @ maria.stuifbergen @ |
Serial |
1537 |
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