King's Centre for Global Health and Health Partnerships, King's College London Faculty of Life Sciences and Medicine, London, UK
King's Centre for Global Health and Health Partnerships, King's College London Faculty of Life Sciences and Medicine, London, UK.
BMJ Open. 2022 May 24;12(5):e054981. doi: 10.1136/bmjopen-2021-054981.
To compare agreement between self-reported height, weight and blood pressure measurements submitted to an online contraceptive service with researcher-measured values and document strategies used for self-reporting.
An observational study.
An online sexual health service which provided the combined oral contraceptive pill, free of charge, to users in Southeast London, England.
Between August 2017 and August 2019, 365 participants were recruited.
The primary outcome, for which the study was powered, was the agreement between self-reported and researcher-measured body mass index (BMI) and blood pressure measurements, compared using kappa coefficients. Secondary measures of agreement included sensitivity, specificity and Bland Altman plots. The study also describes strategies used for self-reporting and classifies their clinical appropriateness.
327 participants fully described their process of blood pressure measurement with 296 (90.5%) classified as clinically appropriate. Agreement between self-reported and researcher-measured BMI was substantial (0.72 (95% CI 0.42 to 1.0)), but poor for blood pressure (0.06 (95% CI -0.11 to 0.23)). Self-reported height and weight readings identified 80.0% (95% CI 28.4 to 99.5) of individuals with a researcher-measured high BMI (≥than 35 kg/m) and 9.1% (95% CI 0.23 to 41.3) of participants with a researcher-measured high blood pressure (≥140/90 mm Hg).
In this study, while self-reported BMI was found to have substantial agreement with researcher-measured BMI, self-reported blood pressure was shown to have poor agreement with researcher-measured blood pressure. This may be due to the inherent variability of blood pressure, overdiagnosis of hypertension by researchers due to 'white coat syndrome' or inaccurate self-reporting. Strategies to improve self-reporting of blood pressure for remote prescription of the combined pill are needed.
比较在线避孕服务中自我报告的身高、体重和血压测量值与研究人员测量值之间的一致性，并记录自我报告所使用的策略。
观察性研究。
为英格兰伦敦东南部的用户免费提供复方口服避孕药的在线性健康服务。
2017 年 8 月至 2019 年 8 月期间，共招募了 365 名参与者。
主要结果（研究的重点）是自我报告和研究人员测量的体重指数（BMI）和血压测量值之间的一致性，使用kappa 系数进行比较。其他一致性测量指标包括敏感性、特异性和 Bland Altman 图。该研究还描述了自我报告所使用的策略，并对其临床适宜性进行了分类。
327 名参与者详细描述了他们的血压测量过程，其中 296 名（90.5%）被归类为临床适宜。自我报告和研究人员测量的 BMI 之间的一致性为中等（0.72（95%CI 0.42 至 1.0）），但血压的一致性较差（0.06（95%CI -0.11 至 0.23））。自我报告的身高和体重读数确定了 80.0%（95%CI 28.4 至 99.5）的研究人员测量的高 BMI（≥35kg/m）个体和 9.1%（95%CI 0.23 至 41.3）的研究人员测量的高血压（≥140/90mmHg）个体。
在这项研究中，虽然自我报告的 BMI 与研究人员测量的 BMI 之间存在显著一致性，但自我报告的血压与研究人员测量的血压之间的一致性较差。这可能是由于血压的固有变异性、研究人员由于“白大衣综合征”而过度诊断高血压或不准确的自我报告所致。需要制定改善远程处方复方避孕药时自我报告血压的策略。
