Background and objective Weight loss and reduced fat-free mass are independent risk factors for mortality among patients with chronic obstructive pulmonary disease (COPD). These factors are important for determining diet therapy and examining the validity of assessment for energy intake (EI). We assessed the agreement of EI between a brief-type self-administered diet history questionnaire (BDHQ) and the doubly labelled water (DLW) method among male patients with stable/at risk for COPD. Method In this cross-sectional observational study, data for 33 male patients were analysed. At the first visit, EI was estimated using a BDHQ (EIBDHQ). Total energy expenditure (TEE) was measured during 13–15 days by the DLW method, while corrected EI was calculated using the TEE and weight change during the DLW period (EIDLW). The difference between EIBDHQ and EIDLW was evaluated by the Bland-Altman method. Multiple regression analysis was used to determine the proportion of variance in the difference between EIBDHQ and EIDLW, as determined by the patient’s characteristics. Results EIBDHQ was 2100 (95% CI: 1905 to 2295) kcal/day in the total population. A fixed bias was observed between EIBDHQ and EIDLW as −186 (95% CI: −422 to 50) kcal/day, while a proportional bias was not detected by the Bland-Altman analysis. Age, weight, anxiety and interleukin 6 were responsible for 61.7% of the variance in the difference between both EIs in a multiple regression model. Conclusions The BDHQ underestimated EI among male patients with stable/at risk for COPD, but this estimation error was within an acceptable range compared with previous studies. EIBDHQ precision might be improved by considering common COPD traits, including inflammatory condition and mental state. Data are available upon reasonable request.

中文翻译：

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慢性阻塞性肺疾病稳定/高危男性患者通过简短型自我饮食史问卷评估能量摄入

背景和目的 体重减轻和去脂体重减少是慢性阻塞性肺疾病 (COPD) 患者死亡的独立危险因素。这些因素对于确定饮食疗法和检查能量摄入 (EI) 评估的有效性很重要。我们评估了简短型自我管理饮食史问卷 (BDHQ) 和双标水 (DLW) 方法之间的 EI 在稳定/有患 COPD 风险的男性患者中的一致性。方法 在这项横断面观察性研究中，分析了 33 名男性患者的数据。在第一次访问时，EI 是使用 BDHQ (EIBDHQ) 估计的。通过 DLW 方法测量 13-15 天内的总能量消耗 (TEE)，而使用 DLW 期间的 TEE 和体重变化 (EIDLW) 计算校正后的 EI。EIBDHQ 和 EIDLW 之间的差异通过 Bland-Altman 方法进行评估。多元回归分析用于确定 EIBDHQ 和 EIDLW 之间差异的方差比例，由患者的特征决定。结果 EIBDHQ 在总人群中为 2100（95% CI：1905 至 2295）kcal/天。在 EIBDHQ 和 EIDLW 之间观察到固定偏差为 -186（95% CI：-422 至 50）kcal/天，而 Bland-Altman 分析未检测到比例偏差。在多元回归模型中，年龄、体重、焦虑和白细胞介素 6 占两种 EI 之间差异的 61.7%。结论 BDHQ 低估了 COPD 稳定/有风险的男性患者的 EI，但与之前的研究相比，该估计误差在可接受的范围内。通过考虑常见的 COPD 特征，包括炎症状况和精神状态，可以提高 EIBDHQ 的精度。可应合理要求提供数据。