67 research outputs found
A procedure to correct proxy-reported weight in the National Health Interview Survey, 1976–2002
<p>Abstract</p> <p>Background</p> <p>Data from the National Health Interview Survey (NHIS) show a larger-than-expected increase in mean BMI between 1996 and 1997. Proxy-reports of height and weight were discontinued as part of the 1997 NHIS redesign, suggesting that the sharp increase between 1996 and 1997 may be artifactual.</p> <p>Methods</p> <p>We merged NHIS data from 1976–2002 into a single database consisting of approximately 1.7 million adults aged 18 and over. The analysis consisted of two parts: First, we estimated the magnitude of BMI differences by reporting status (i.e., self-reported versus proxy-reported height and weight). Second, we developed a procedure to correct biases in BMI introduced by reporting status.</p> <p>Results</p> <p>Our analyses confirmed that proxy-reports of weight tended to be biased downward, with the degree of bias varying by race, sex, and other characteristics. We developed a correction procedure to minimize BMI underestimation associated with proxy-reporting, substantially reducing the larger-than-expected increase found in NHIS data between 1996 and 1997.</p> <p>Conclusion</p> <p>It is imperative that researchers who use reported estimates of height and weight think carefully about flaws in their data and how existing correction procedures might fail to account for them. The development of this particular correction procedure represents an important step toward improving the quality of BMI estimates in a widely used source of epidemiologic data.</p
Note sur l'intensité du froid au mois de janvier dernier : (1838)
par A. QueteletAus: Bulletins de l'Académie Royale de Bruxelles, Tom. V, n
Lettre de Quételet, Adolphe à Ampère, André-Marie
Correspondance d\u27André-Marie Ampèr
Sur la statistique morale et les principes qui doiÂvent en former la base
QuĂ©telet A. Sur la statistique morale et les principes qui doiÂvent en former la base. In: DĂ©viance et sociĂ©tĂ©. 1984 - Vol. 8 - N°1. pp. 13-41
Notice sur les étoiles filantes, suivie des résultats des observations météorologiques horaires faites à Bruxelles, Louvain, Gand et Alost, à l'époque de l'équinoxe d'automne 1838
Adolphe QueteletAus: Bulletins de l'Academie Royale de Bruxelles. T. 5, Nr. 9. 183
Notice sur le télégraphe électrique de M. Wheatstone
par A. QueteletAus: Bulletins de l'Académie Royale de Bruxelles, Tom. V, n
Sur le climat de la Belgique
par A. QueteletBand 1: 1849, [2] Blätter, Kapitel 1-3, 208 Seiten, 187 Seiten, 76 Seiten, [5] Falttafeln ; Band 2: 1857, VI, Kapitel 4-7, 106 Seiten, [1] Blatt, 155 Seiten, [2] Blätter, 110 Seiten, [1] Blatt, 55 Seiten, 120 Seiten, [8] Falttafel
Note sur le magnétisme terrestre, suivie des résultats des observations météorologiques horaires, faites à Bruxelles, Louvain et Alost et Londres à l'équinoxe du printemps de 1838
A. QuételetAus: Bulletin de l'Academie Royale de Bruxelles ; T. 5, Nr. 4. 183
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