Validity of self-reported body mass index among middle-aged participants in the Norwegian Women and Cancer study

Skeie, Guri; Mode, Nicolle A.; Henningsen, Maria; Borch, Kristin Benjaminsen

doi:10.2147/clep.s83839

Cited by 82 publications

(79 citation statements)

References 27 publications

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“…47 There was, however, a small but statistically significant under-reporting of weight, which would affect self-reported BMI; this tendency was largest among overweight and obese women. 20,47 A survey of the PA levels in the adult population in Norway showed that 34% of women reached the national guidelines for PA. 48 This proportion is higher than in our study. The relatively large number of cases made it possible to investigate subtypes of endometrial cancer, however the proportion of type 2 endometrial cancer was too low to allow for separate analyses.…”

Section: Discussionmentioning

confidence: 95%

“…Self‐reported BMI has been validated for the NOWAC study, indicating that there was a substantial agreement between self‐reported and measured BMI values . There was, however, a small but statistically significant under‐reporting of weight, which would affect self‐reported BMI; this tendency was largest among overweight and obese women . A survey of the PA levels in the adult population in Norway showed that 34% of women reached the national guidelines for PA .…”

Section: Discussionmentioning

confidence: 99%

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Physical activity and risk of endometrial cancer in the Norwegian Women and Cancer (NOWAC) study

Borch

Weiderpass

Braaten

et al. 2017

Intl Journal of Cancer

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Few studies have investigated the association between endometrial cancer and physical activity (PA) using repeated measures of PA and different subtypes of endometrial cancer. We aimed to investigate the association between endometrial cancer and PA level at two points in time in women with different body mass index (BMI) profiles, and to calculate the population attributable fraction (PAF) of endometrial cancer for low PA levels. We included 82,759 women with complete information on PA at baseline in the Norwegian Women and Cancer Study; 52,370 had follow-up information on PA. 687 endometrial cancer cases were identified. Multivariate cox proportional hazard models were used to estimate hazard ratios (HR) and 95% confidence intervals (CI). The PAF indicated the proportion of endometrial cancer that could be avoided in the population if these women had a higher PA level. There was a statistically significant association between low PA levels at baseline and follow-up and endometrial cancer risk, with a dose-response trend (lowest PA level: HR = 1.60, 95% CI 1.16-2.20; highest PA level: HR = 0.73, 95% CI 0.45-1.16 compared to the median). Analyses that included follow-up measurements yielded similar results. 21.9% (95% CI 7.1-34.3) of endometrial cancers could be avoided if women with low PA levels (≤ 4 in a 1-10 degree self reported PA scale) increased their PA levels to 5-10. We found an inverse dose-response association between PA and endometrial cancer, independent of BMI. In this nationally representative cohort, 21.9% of endometrial cancers could potentially be avoided if PA levels increased to higher PA levels.

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Section: Discussionmentioning

confidence: 95%

Section: Discussionmentioning

confidence: 99%

Physical activity and risk of endometrial cancer in the Norwegian Women and Cancer (NOWAC) study

Borch

Weiderpass

Braaten

et al. 2017

Intl Journal of Cancer

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“…Height and weight were self-reported, and there is a well-established tendency to underestimate height and weight, which increases with age and BMI [33]. A validation study of BMI in NOWAC was recently conducted and showed substantial agreement between self-reports and objective measurements values, although greater misclassification due to underreporting was observed in women with overweight and obesity [34]. Further, the physical activity scale in NOWAC was recently validated against a sensor that monitored heart rate and movement, showing a significant agreement but only moderate Spearman's rank correlation coefficients (0.36-0.46, p < 0.001) [35].…”

Section: Discussionmentioning

confidence: 99%

Factors Associated with High Weight Gain and Obesity Duration: The Norwegian Women and Cancer (NOWAC) Study

Silva¹,

Weiderpass²,

Licaj³

et al. 2018

Obes Facts

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Aim: To identify factors associated with high weight gain and obesity duration in a representative sample of Norwegian women. Methods: 66,618 Norwegian women aged 34-70 years at baseline were included in the analysis. Baseline and follow-up questionnaires completed in 1991-2011 provided information on height, weight as well as sociodemographic, lifestyle and reproductive factors. We assessed the association with multivariable logistic regression. Results: Women gained on average 0.5 kg/year (95% CI 0.5-0.5 kg/year) during 6 years of follow-up, and 3.5% maintained in obesity during 13 years of follow-up. The factors with strongest association with high weight gain (≥10 kg) were smoking cessation (cessation vs. no change, OR = 4.39, 95% CI 3.91-4.94) and decreased physical activity level (decrease vs. no change, OR = 2.40, 95% CI 2.21-2.61). Low physical activity level (high vs. low, OR = 0.17, 95% CI 0.14-0.20), higher than median age at menarche (over median vs. median or under median, OR = 0.36, 95% CI 0.31-0.41), and less than 10 years of education (>12 years vs. <10 years, OR = 0.44, 95% CI 0.37-0.51) were strongly associated with obesity duration. Conclusion: The modifiable factor with the strongest association with adverse weight development and potential for prevention was low or decreased physical activity level.

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“…The cancer rates are the same in our cohort as in the general population of the same age [19] and the prevalence of obesity in this paper is slightly lower than that of the general population (10%, 2012) [45]. Also, as mentioned above, the diet questions have been validated, as has the question on physical activity [26], diabetes [21] and BMI [27], and the results are in the same range as those found in other cohorts. Also, only one question was asked regarding preparation methods of potatoes to the women in the NOWAC study, but as shown above, this is the preferred preparation method in this age group.…”

Section: Discussionmentioning

confidence: 99%

Change in potato consumption among Norwegian women 1998-2005—The Norwegian Women and Cancer study (NOWAC)

2017

Self Cite

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Studies have shown that potato consumption in Norway have been on the decline in recent years. Increase in income and the association of potato consumption with weight gain and chronic diseases like type 2 diabetes have been identified as some of the factors responsible for the change. The aim of this study was to describe the change in potato consumption within persons and how non-dietary variables influenced that change among participants in the Norwegian Women and Cancer study (NOWAC). A prospective analysis was performed in the NOWAC cohort using linear regression. Data on dietary, lifestyle, socioeconomic and health-related factors were collected by mailed questionnaires. The change in potato consumption among 38,820 women aged 41–70 years was investigated using two measurements taken at intervals of 4–6 years. At baseline, mean intake was 112g per day; this had decreased to 94.5g per day at the second measurement. Results showed that the percentage of women who reported that they ate less than 1 potato a day increased from 24.6% at baseline to 35.5% at the second measurement. Those who reported that they ate more than 3 potatoes a day had decreased from 20.2% of the participants at baseline to 12.1% at the second measurement. Multivariable adjusted results show that geography was an important predictor of potato consumption at second measurement. Living in the north compared to Oslo (the capital) was associated with higher intake of potato at second measurement (B: 0.60, 95% CI: 0.55–0.65). Compared to women living with a partner, living alone was associated with lower potato intake at second measurement (B: -0.13, 95% CI: -0.17 –-0.09) while living with children tended to be associated with higher potato intake at second measurement (B: 0.01, 95% CI: -0.02–0.04). Younger age, more years of education, higher income or BMI was associated with a lower potato intake at second measurement. Smoking was associated with a higher intake of potato at second measurement (B: 0.03, 95% CI: 0.00–0.06 for smokers compared to non-smokers). Having diabetes at baseline was associated with lower intake of potato at second measurement (B: -0.04, 95% CI: -0.14 –-0.06 for non-diabetics compared to diabetics). Potato consumption among women in the NOWAC study showed a decline over the period studied. Change in the consumption was found to be influenced by age, education, income, household structure, region of residence as well as health-related factors like smoking and diabetes. The use of repeated measures is necessary to continue the monitoring and also to understand the stability and direction of the possible change in diet of a population.

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Validity of self-reported body mass index among middle-aged participants in the Norwegian Women and Cancer study

Cited by 82 publications

References 27 publications

Physical activity and risk of endometrial cancer in the Norwegian Women and Cancer (NOWAC) study

Physical activity and risk of endometrial cancer in the Norwegian Women and Cancer (NOWAC) study

Factors Associated with High Weight Gain and Obesity Duration: The Norwegian Women and Cancer (NOWAC) Study

Change in potato consumption among Norwegian women 1998-2005—The Norwegian Women and Cancer study (NOWAC)

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