Human Environments Analysis Laboratory, University of Western Ontario, London, ON, Canada; Department of Geography, University of Western Ontario, London, ON, Canada.
Human Environments Analysis Laboratory, University of Western Ontario, London, ON, Canada; Department of Paediatrics, University of Western Ontario, London, ON, Canada; Lawson Health Research Institute, London, ON, Canada; Children's Health Research Institute, London, ON, Canada; School of Food and Nutritional Sciences, Brescia University College, University of Western Ontario, London, ON, Canada; Department of Epidemiology & Biostatistics, University of Western Ontario, London, ON, Canada.
Waste Manag. 2020 Jan 1;101:18-27. doi: 10.1016/j.wasman.2019.09.032. Epub 2019 Oct 3.
A survey, based on an expanded Theory of Planned Behavior (TPB), was used to indirectly measure self-reported food wasting and its behavioral determinants. This was complemented with directly and objectively measured food waste in curbside garbage samples. Households (n = 189) reported throwing out avoidable food waste a mean of 5.48 times (SD = 5.58) and 6.63 portions (SD = 6.61) the week prior to completing the survey. These same households threw out a mean of 2,783 g/week of food waste (SD = 2,664) in a curbside garbage sample, with 63.27% of this consisting of avoidable food waste. There were weak to fair correlations between self-reported and curbside food waste samples. The direction and level of significance of all correlations of TPB behavioral determinants with self-reported and curbside food waste samples were similar, although the correlation coefficients were higher for self-reported food wasting. A linear regression (R = 0.34, p < 0.001) on self-reported avoidable food waste frequency demonstrated that it was significantly (p < 0.05) associated with perceived behavioral control, personal attitude, number of people per household, gender and employment status. This was contrasted with a linear regression (R = 0.19, p < 0.001) on curbside avoidable food waste which was also significantly (p < 0.05) associated with perceived behavioral control and number of people per household, but also housing tenure type (owner-occupancy vs tenancy) and the good provider identity. In general, self-reported results should be used with caution as they may underestimate food waste disposal and consideration should be given to supplement, if not replace, them with direct measurement of food waste disposal.
一项基于扩展的计划行为理论（TPB）的调查被用于间接测量自我报告的食物浪费及其行为决定因素。这与路边垃圾样本中直接和客观测量的食物浪费相补充。家庭（n=189）报告在完成调查前一周平均扔掉 5.48 次（SD=5.58）和 6.63 份（SD=6.61）可避免的食物浪费。这些相同的家庭在路边垃圾样本中扔掉了平均 2783g/周的食物垃圾（SD=2664），其中 63.27%是可避免的食物垃圾。自我报告的食物垃圾和路边垃圾样本之间存在弱到中度的相关性。TPB 行为决定因素与自我报告和路边食物垃圾样本的相关性的方向和显著性水平相似，尽管自我报告的食物浪费相关性系数更高。对自我报告的可避免食物浪费频率的线性回归（R=0.34，p<0.001）表明，它与感知行为控制、个人态度、家庭人口数、性别和就业状况显著相关（p<0.05）。这与路边可避免食物垃圾的线性回归（R=0.19，p<0.001）形成对比，后者也与感知行为控制和家庭人口数显著相关（p<0.05），但也与住房持有类型（自有住房与租赁住房）和良好提供者身份相关。一般来说，自我报告的结果应该谨慎使用，因为它们可能低估了食物垃圾的处理，应考虑补充，如不能替代，直接测量食物垃圾的处理。
