Kruger Herculina S, Botha-Ravyse Chrisna, Havemann-Nel Lize, Doubell Maretha, van Rooyen Johannes M
Centre of Excellence for Nutrition, North-West University, Potchefstroom Campus, Potchefstroom, 2520, South Africa.
Medical Research Council Hypertension and Cardiovascular Disease Research Unit, North-West University, Potchefstroom Campus, Potchefstroom, 2520, South Africa.
Am J Hum Biol. 2017 Nov;29(6). doi: 10.1002/ajhb.23042. Epub 2017 Jul 12.
To derive percentage body fat (%BF) cut-points according to body mass index (BMI) categories for adult black South African women and to investigate the agreement between adiposity classifications according to WHO BMI and %BF cut-points. The secondary aim was to determine the association between these different adiposity measures and high blood pressure.
Black women aged 29-65 years (n = 435) from Ikageng, South Africa, were included in this cross-sectional study. Socio-demographic and anthropometric data were collected (weight, height and BMI). %BF using dual-energy X-ray absorptiometry and blood pressure were measured.
There was significant agreement between three %BF categories: low/normal (<35.8% age 29-49 years; or <38% age 50-65 years), overweight range (35.8-40.7% age 29-49 years; or 38-42.1% age 50-65 years) and obese (≥40.7% age 29-49 years; or ≥42.1% age 50-65 years) and three BMI categories: low/normal (<25 kg/m ), overweight range (25-29.9 kg/m ) and obese (≥30kg/m ); (κ = 0.62, P < .0001). Despite statistically significant agreement between groups, more than half of overweight individuals were misclassified as having either a normal (30.2%) or obese %BF (25.5%). %BF misclassification was low in the low/normal and obese BMI ranges. After adjustment for confounders, obesity (BMI ≥ 30kg/m ), as well as high %BF were significantly associated with high blood pressure (OR = 1.75, 95% CI 1.09-2.81 versus OR = 1.92, 95% CI 1.15-3.23, respectively).
Despite significant agreement between BMI and %BF categories, considerable misclassification occurred in the overweight range. Participants with excessive %BF had a greater odds of high blood pressure than those in the highest BMI category.
为成年南非黑人女性根据体重指数（BMI）类别得出体脂百分比（%BF）切点，并调查根据世界卫生组织BMI分类和%BF切点得出的肥胖分类之间的一致性。次要目的是确定这些不同肥胖测量指标与高血压之间的关联。
来自南非伊卡根的29至65岁黑人女性（n = 435）纳入了这项横断面研究。收集了社会人口统计学和人体测量数据（体重、身高和BMI）。使用双能X线吸收法测量%BF并测量血压。
在三个%BF类别（低/正常，29至49岁时<35.8%；或50至65岁时<38%；超重范围，29至49岁时35.8至40.7%；或50至65岁时38至42.1%；肥胖，29至49岁时≥40.7%；或50至65岁时≥42.1%）和三个BMI类别（低/正常，<25kg/m²；超重范围，25至²9.9kg/m²；肥胖，≥30kg/m²）之间存在显著一致性；（κ = 0.62，P <.0001）。尽管组间在统计学上有显著一致性，但超过一半的超重个体被错误分类为正常（30.2%）或肥胖%BF（25.5%）。在低/正常和肥胖BMI范围内，%BF错误分类较低。在对混杂因素进行调整后，肥胖（BMI≥30kg/m²）以及高%BF与高血压显著相关（OR分别为1.75，95%CI 1.09至2.81和OR为1.92，95%CI 1.15至3.23）。
尽管BMI和%BF类别之间存在显著一致性，但在超重范围内仍发生了相当多的错误分类。%BF过高的参与者患高血压的几率比BMI最高类别的参与者更高。
