The University of Queensland, School of Population Health, Cancer Prevention Research Centre, Brisbane, Australia.
Med Sci Sports Exerc. 2011 May;43(5):822-8. doi: 10.1249/MSS.0b013e3182019510.
To examine the relationship of self-reported television (TV) viewing time with accelerometer-derived total sedentary time and to determine whether it differs by subgroup.
Using data for adults (≥20 yr) from the 2003-2004 and 2005-2006 nationally representative US National Health and Nutrition Examination Surveys (NHANES; n=5738), linear regression models examined the associations of categories of self-reported TV viewing time (<1, 1, 2, 3, 4, and >5 h·d) with accelerometer-derived sedentary time (<100 counts per minute; h·d). Spearman ρ assessed the correlation between participants' rankings on the two measures. Analyses were stratified by gender, age, race/ethnicity, and, in the 2003-2004 NHANES cycle, by work status among working-aged adults (20-65 yr, n=2069).
TV viewing time was significantly associated with sedentary time, with positive associations for all gender, age, race/ethnicity groups, and for those not working or working part-time, but not for those in full-time work. However, correlations between rankings of the measures were only "fair" overall (ρ=0.22) and were similar for all gender and racial/ethnic groups and for those of mid- and older age but not for those of younger age (20-39 yr, ρ=0.05). In the working-aged subgroup, there was also a fair correlation between the measures for those not working (ρ=0.22) but no significant correlation for those in part-time (ρ=0.14) or full-time work (ρ=0.03).
Associations of TV viewing time with accelerometer-derived total sedentary time were statistically significant, but correlations were of only fair magnitude, and the strength of the relationship was not consistent across all population subgroups. These findings suggest that TV viewing time has an influence on overall sedentary time at a population level; however, measurement of sedentary time in other domains is also important.
研究自我报告的电视（TV）观看时间与加速度计得出的总久坐时间之间的关系，并确定其是否因亚组而异。
利用 2003-2004 年和 2005-2006 年全美具有代表性的美国国家健康和营养检查调查（NHANES；n=5738）中成年人（≥20 岁）的数据，线性回归模型研究了自我报告的 TV 观看时间分类（<1、1、2、3、4 和>5 h·d）与加速度计得出的久坐时间（<100 计数/分钟；h·d）之间的关联。Spearman ρ 评估了参与者在这两种测量方法上的排名之间的相关性。分析按性别、年龄、种族/民族以及在 2003-2004 年 NHANES 周期中按工作年龄（20-65 岁，n=2069）的工作状态进行分层。
TV 观看时间与久坐时间显著相关，所有性别、年龄、种族/民族群体以及非全职或兼职工作者均呈正相关，但全职工作者则无此关联。然而，两种测量方法的排名之间的相关性总体上只是“中等”（ρ=0.22），并且在所有性别和种族/民族群体以及年龄较大和中年群体中相似，但在年龄较小（20-39 岁）的群体中则不相似（ρ=0.05）。在工作年龄亚组中，对于非全职工作者，两种测量方法之间也存在中等相关性（ρ=0.22），但对于兼职工作者（ρ=0.14）或全职工作者（ρ=0.03）则无显著相关性。
TV 观看时间与加速度计得出的总久坐时间之间的关联具有统计学意义，但相关性的大小仅为中等，且关系的强度在所有人群亚组中并不一致。这些发现表明，在人群水平上，TV 观看时间对总久坐时间有影响；然而，在其他领域测量久坐时间也很重要。
