TAILIEUCHUNG - International Textbook of Obesity - part 2

đã được thực hiện để giải quyết vấn đề này. Williamson và các đồng nghiệp quan sát thấy rằng khi phân tích được hạn chế để giảm cân trong số không bao giờ hút thuốc lá, cá nhân thừa cân, người báo cáo rằng giảm cân của họ là cố ý | BODYWEIGHT BODY COMPOSITION AND LONGEVITY 43 Table Two by two table weight loss by intention No intention to lose weight Intention to lose weight Did not lose weight Lost weight Based on Meltzer and Everhart 88 . have been conducted to address this issue. Williamson and colleagues observed that when analyses are restricted to weight loss among never-smoking overweight individuals who reported that their weight loss was intentional weight loss was associated with either a beneficial effect or no effect. For further discussion of these studies see French et al. 85 Kuller 86 and Williamson et al. 87 . However it is important to realize that the so-called intentional weight loss studied by these investigators may often by unintentional. Consider the following. Meltzer and Everhart 88 studied participant attributions of weight loss intention in a large population-based survey. Among women they found the following of overweight women reported attempting to lose weight. Of those women attempting to lose weight did lose weight. The adjusted odds ratio for weight loss given that one intends to lose weight is reported to be . Similar results were obtained for men. Using these three numbers and some algebra one can derive the 2 X 2 table shown in Table expressed in proportions. Applying the standard attributable risk approach this implies that 46 of overweight women who intend to lose weight do lose weight but that 19 would have lost weight even if they had not intended to do so. Therefore the fraction of weight loss among overweight women who intend to lose weight that is due to factors other than their intention is about 41 . 19 46 . These calculations suggest that some large sub-portion of those who have been designated as intentional weight losers in past studies may have actually lost weight through some other mechanism such as occult illness. If this were true the currently observed equivocally beneficial effects of what

Đã phát hiện trình chặn quảng cáo AdBlock
Trang web này phụ thuộc vào doanh thu từ số lần hiển thị quảng cáo để tồn tại. Vui lòng tắt trình chặn quảng cáo của bạn hoặc tạm dừng tính năng chặn quảng cáo cho trang web này.