Background Willingness to Pay (WTP) is an alternative to measure quality-adjusted life years for cost-effectiveness analyses. The aim was to evaluate longitudinal changes and determinants of parental WTP for the prevention of childhood overweight and obesity. Methods Longitudinal data from post- (T2) and follow-up (T3) measurements of a school-based health promotion program in Germany. Parental questionnaires included general WTP and the corresponding amount to reduce incidental childhood overweight and obesity by half. Longitudinal differences were examined with the McNemar test for general WTP and the Wilcoxon signed-rank test for the amount of WTP. Regression analyses were conducted to detect determinants. Results General parental WTP significantly decreased from 48.9% to 35.8% ( p < 0.001, n = 760). Logistic regression analysis ( n = 561) showed that parents with a tertiary education level and a positive general WTP at T2, families with a higher monthly household income, and those with abdominally obese children were significant predictors of general WTP at T3. Median amount of WTP at T3 was €20.00 (mean = €27.96 ± 26.90, n = 274). Assuming a WTP of €0 for those who were generally not willing to pay or did not answer, resulted in a median amount of WTP at T3 of €0 (m = €8.45, sd = €19.58, n = 906). According to linear regression analysis WTP at T2 was the only significant predictor for the amount of WTP at T3 ( p = 0.000, n = 181). Conclusions Despite the decline of general WTP, these results are a reflection of the public awareness of the problem and the need for action. Policy makers should recognize this and initiate sustainable public preventive strategies. Trial registration DRKS, DRKS00000494 . Registered 25 August 2010, https://www.drks.de/drks_web/ .

中文翻译：

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父母为预防儿童超重和肥胖付费的意愿的纵向变化和决定因素。


背景 支付意愿 (WTP) 是衡量质量调整生命年以进行成本效益分析的替代方法。目的是评估父母预防儿童超重和肥胖的意愿的纵向变化和决定因素。方法 来自德国学校健康促进计划的事后 (T2) 和随访 (T3) 测量的纵向数据。家长调查问卷包括一般支付意愿和相应金额，以将儿童偶然超重和肥胖减少一半。纵向差异通过一般支付意愿的 McNemar 检验和支付意愿金额的 Wilcoxon 符号秩检验进行检验。进行回归分析以检测决定因素。结果 一般父母的 WTP 从 48.9% 显着下降至 35.8% ( p < 0.001, n = 760)。 Logistic回归分析（n = 561）显示，具有高等教育水平且T2时一般WTP为正的父母、家庭月收入较高的家庭以及有腹部肥胖儿童的家庭是T3时一般WTP的显着预测因素。 T3 时的 WTP 中位数为 €20.00（平均值 = €27.96 ± 26.90，n = 274）。假设那些通常不愿意付款或不回答的人的 WTP 为 0 欧元，则 T3 时的 WTP 中位数为 0 欧元（m = 8.45 欧元，sd = 19.58 欧元，n = 906）。根据线性回归分析，T2 时的 WTP 是 T3 时 WTP 量的唯一显着预测因子（p = 0.000，n = 181）。结论 尽管总体支付意愿下降，这些结果反映了公众对问题的认识和采取行动的必要性。政策制定者应认识到这一点并启动可持续的公共预防战略。试用注册DRKS，DRKS00000494。 2010 年 8 月 25 日注册，https://www.drks.de/drks_web/ 。