Monteiro Carlos Augusto, Florindo Alex Antonio, Claro Rafael Moreira, Moura Erly Catarina
Núcleo de Pesquisas Epidemiológicas em Nutrição e Saúde, Universidade de São Paulo, São Paulo, SP, Brasil.
Rev Saude Publica. 2008 Aug;42(4):575-81. doi: 10.1590/s0034-89102008000400001.
To assess the reliability and validity of indicators of physical activity and sedentariness obtained by means of a telephone-based surveillance system.
Reliability and validity studies were carried out in two random subsamples (n=110 and n=111, respectively) obtained from the total sample (N=2,024) of adults (> or =18 years) studied by the system in the municipality of São Paulo in 2005. Studied indicators included frequency of "sufficiently active during leisure time," "inactive in four domains of physical activity (leisure, work, transportation, and housework)," and "habit of watching television for long periods." Reliability was assessed by comparing results of the original telephone interview with those of another identical interview repeated after seven to 15 days. Validity was assessed by comparing the results of the telephone interview with those of three 24-hour recalls (reference method) carried out in the week following the original interview.
Frequencies obtained for of the three evaluated indicators were either identical or very similar for the first and second telephone interviews. Kappa coefficients ranged from 0.53 to 0.80, indicating good reliability for all indicators. In relation to the reference method, all indicators showed 80% or higher specificity, and sensitivity values were 69.7% for "watching television for long periods," 59.1% for "inactive in four domains," and 50% for "sufficiently active during leisure."
The indicators of physical activity and sedentariness included in the system seem reliable and sufficiently accurate. If kept operational in coming years, this system may provide Brazil with a useful instrument for evaluating public policies aimed at promoting physical activity and controlling non-transmissible chronic diseases associated with sedentariness.
评估通过电话监测系统获取的身体活动和久坐行为指标的可靠性和有效性。
可靠性和有效性研究在两个随机子样本中进行（分别为n = 110和n = 111），这两个子样本取自2005年在圣保罗市该系统研究的成年人总样本（N = 2,024，年龄≥18岁）。研究指标包括“休闲时间足够活跃”的频率、“在身体活动的四个领域（休闲、工作、交通和家务）不活跃”以及“长时间看电视的习惯”。通过比较最初电话访谈的结果与7至15天后重复进行的另一次相同访谈的结果来评估可靠性。通过将电话访谈的结果与在最初访谈后的一周内进行的三次24小时回忆（参考方法）的结果进行比较来评估有效性。
第一次和第二次电话访谈中，三个评估指标的频率相同或非常相似。Kappa系数范围为0.53至0.80，表明所有指标具有良好的可靠性。与参考方法相比，所有指标的特异性均达到80%或更高，“长时间看电视”的敏感性值为69.7%，“在四个领域不活跃”为59.1%，“休闲时间足够活跃”为50%。
该系统中包含的身体活动和久坐行为指标似乎可靠且足够准确。如果在未来几年保持运行，该系统可能为巴西提供一个有用的工具，用于评估旨在促进身体活动和控制与久坐相关的非传染性慢性病的公共政策。
