Sex-specific height-correction of weight in a population with ethnic groups that differ in stature - the SAMINOR 1 Survey: a cross-sectional study

Sex-specific height-correction of weight in a population with ethnic groups that differ in stature - the SAMINOR 1 Survey: a cross-sectional study

Background: Body mass index (BMI, weight/height2) is a common proxy for body fatness, but it is negatively correlated with height. In Norway, the ethnic Sami people have had higher BMI and lower height than their non-Sami peers. This article aimed to examine if previous findings of higher obesity me...

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Veröffentlicht in:Social-medicinsk tidskrift 2021
Hauptverfasser: Michalsen, Vilde Lehne, Coucheron, David Andre, Kvaløy, Kirsti, Melhus, Marita
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creator Michalsen, Vilde Lehne
Coucheron, David Andre
Kvaløy, Kirsti
Melhus, Marita
description Background: Body mass index (BMI, weight/height2) is a common proxy for body fatness, but it is negatively correlated with height. In Norway, the ethnic Sami people have had higher BMI and lower height than their non-Sami peers. This article aimed to examine if previous findings of higher obesity measures in Sami compared to non-Sami persist when applying an adequately height-corrected weight index. Methods: We estimated a sex-specific height-corrected weight index—the Benn index—that is, weight/heightp where p is estimated from log(weight)-log(height) regression. We used data on 15 717 men and women aged 30 and 36–79 years who participated in the SAMINOR 1 Survey (2003–2004). Correlations between height and weight and the indices BMI and Benn index were calculated using Pearson’s correlation coefficient. Results: BMI and height had a modest, negative correlation. Analyses were stratified by sex due to a statistically significant interaction (sex * log(height), p
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In Norway, the ethnic Sami people have had higher BMI and lower height than their non-Sami peers. This article aimed to examine if previous findings of higher obesity measures in Sami compared to non-Sami persist when applying an adequately height-corrected weight index. Methods: We estimated a sex-specific height-corrected weight index—the Benn index—that is, weight/heightp where p is estimated from log(weight)-log(height) regression. We used data on 15 717 men and women aged 30 and 36–79 years who participated in the SAMINOR 1 Survey (2003–2004). Correlations between height and weight and the indices BMI and Benn index were calculated using Pearson’s correlation coefficient. Results: BMI and height had a modest, negative correlation. Analyses were stratified by sex due to a statistically significant interaction (sex * log(height), p&lt;0.001). There was no interaction with ethnicity (ethnicity * log(height), p=0.07 in women and p=0.24 in men). The p (95% confidence interval) in Benn index (weight/heightp) was estimated to 1.29 (1.21, 1.38) in women and 1.90 (1.83, 1.98) in men. Higher BMI in Sami compared to non-Sami was most evident in women, but Benn index did not differ by ethnicity in either sex. Conclusion: Previous findings of higher obesity measures in Sami than in non-Sami may be biased. Future studies should take into account the marked height differences between these groups when comparing obesity indices.</description><identifier>ISSN: 0037-833X</identifier><language>eng</language><publisher>Karolinska institutet</publisher><ispartof>Social-medicinsk tidskrift, 2021</ispartof><rights>info:eu-repo/semantics/openAccess</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>230,314,776,780,881,4010,26544</link.rule.ids></links><search><creatorcontrib>Michalsen, Vilde Lehne</creatorcontrib><creatorcontrib>Coucheron, David Andre</creatorcontrib><creatorcontrib>Kvaløy, Kirsti</creatorcontrib><creatorcontrib>Melhus, Marita</creatorcontrib><title>Sex-specific height-correction of weight in a population with ethnic groups that differ in stature - the SAMINOR 1 Survey: a cross-sectional study</title><title>Social-medicinsk tidskrift</title><description>Background: Body mass index (BMI, weight/height2) is a common proxy for body fatness, but it is negatively correlated with height. In Norway, the ethnic Sami people have had higher BMI and lower height than their non-Sami peers. This article aimed to examine if previous findings of higher obesity measures in Sami compared to non-Sami persist when applying an adequately height-corrected weight index. Methods: We estimated a sex-specific height-corrected weight index—the Benn index—that is, weight/heightp where p is estimated from log(weight)-log(height) regression. We used data on 15 717 men and women aged 30 and 36–79 years who participated in the SAMINOR 1 Survey (2003–2004). Correlations between height and weight and the indices BMI and Benn index were calculated using Pearson’s correlation coefficient. Results: BMI and height had a modest, negative correlation. Analyses were stratified by sex due to a statistically significant interaction (sex * log(height), p&lt;0.001). There was no interaction with ethnicity (ethnicity * log(height), p=0.07 in women and p=0.24 in men). The p (95% confidence interval) in Benn index (weight/heightp) was estimated to 1.29 (1.21, 1.38) in women and 1.90 (1.83, 1.98) in men. Higher BMI in Sami compared to non-Sami was most evident in women, but Benn index did not differ by ethnicity in either sex. Conclusion: Previous findings of higher obesity measures in Sami than in non-Sami may be biased. 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