Cancer Prevention Research Centre, School of Population Health, The University of Queensland, Brisbane, Australia.
Am J Health Promot. 2011 Mar-Apr;25(4):257-63. doi: 10.4278/ajhp.090223-QUAN-75.
To examine associations of intervention dose with behavior change outcomes in a telephone counseling intervention for physical activity and dietary change.
Secondary analysis of intervention participants from a cluster-randomized controlled trial.
Primary care practices in a disadvantaged community in Queensland, Australia.
Adult patients with type 2 diabetes or hypertension.
Patients (n = 228) received telephone counseling over a 12-month period. The initiation phase (1-4 months) consisted of up to 10 weekly or fortnightly calls; the maintenance-enhancement phase (5-12 months) consisted of up to eight monthly calls.
Intervention dose was defined as the number of calls completed in total and during each phase and was categorized into tertiles. Diet and physical activity were measured using validated self-report instruments.
Multivariate analyses of call completion and change in health behaviors.
Those completing a high number of calls were more likely to be female, white, older than 60 years, retired, and earning less than an average weekly Australian wage. Relative to low call completion, high completion during the maintenance-enhancement phase was associated with significantly greater (least squares mean [SE]) behavioral improvement for the following: total fat intake as percentage of calories (-3.58% [.74%]), saturated fat intake (-2.51% [.51%]), fiber intake (4.23 [1.20] g), and moderate-to-vigorous physical activity (187.82 [44.78] minutes).
Interventions of longer duration may be required to influence complex behaviors such as physical activity and fat and fiber intake.
在一项针对体力活动和饮食改变的电话咨询干预中，检验干预剂量与行为改变结果之间的关联。
一项集群随机对照试验中干预参与者的二次分析。
澳大利亚昆士兰州一个弱势社区的初级保健诊所。
患有 2 型糖尿病或高血压的成年患者。
患者（n = 228）接受了为期 12 个月的电话咨询。启动阶段（1-4 个月）包括最多 10 次每周或每两周一次的电话咨询；维持-增强阶段（5-12 个月）包括最多 8 次每月电话咨询。
干预剂量定义为完成的电话咨询总数和每个阶段的电话咨询次数，并分为三分位数。饮食和体力活动使用经过验证的自我报告工具进行测量。
对电话咨询完成情况和健康行为变化的多变量分析。
完成大量电话咨询的患者更有可能是女性、白人、年龄大于 60 岁、退休和收入低于平均每周澳大利亚工资。与低电话咨询完成率相比，维持-增强阶段的高完成率与以下方面的行为改善显著相关（最小二乘均值[SE]）：总脂肪摄入量占卡路里的百分比（-3.58%[.74%]）、饱和脂肪摄入量（-2.51%[.51%]）、纤维摄入量（4.23[1.20]g）和中等至剧烈体力活动（187.82[44.78]分钟）。
可能需要更长时间的干预才能影响体力活动和脂肪及纤维摄入等复杂行为。
