Sorensen J A, Jenkins P L, Bayes B, Madden E, Purschwitz M A, May J J
The Northeast Center/New York Center for Agricultural Medicine and Health, Bassett Healthcare, One Atwell Rd, Cooperstown, NY 13326, USA.
J Agric Saf Health. 2013 Apr;19(2):115-24. doi: 10.13031/jash.19.9971.
In 2006, a social marketing campaign was developed to increase the installation of rollover protective structures (ROPS) on unprotected New York tractors. Using data gathered from the program's hotline, the impact of price increases on farmers' interest in ROPS is examined. Pricing data were obtained for all rigid ROPS kits commercially available in the U.S. since 2006. These data were stratified into two groups of ROPS suppliers: (1) tractor manufacturers that sell ROPS for their own tractors, referred to in this study as original equipment manufacturers (OEMs), and (2) aftermarket (AM) ROPS suppliers. The trend in price increases was contrasted with the change in the consumer price index (CPI), the probability of retrofitting within quintiles of cost was estimated, and the increase in ROPS prices over time was plotted The average price increase for a ROPS kit (excluding shipping and installation) over the six years of the study was 23.3% for OEM versus 60.5% for AM (p < 0.0001). Out-of-pocket expenses held steady for OEM versus a six-year increase of $203 for AM (p = 0.098). The probability of a farmer retrofitting dropped monotonically from 66.9% in the lowest ROPS cost quintile to 23% in the highest. If these trends continue, the proportion of inquiries resulting in a ROPS retrofit will fall below 20% by 2020 for AM ROPS. Based on other trends identified in the literature, it is reasonable to assume that decreases in ROPS installation are likely to affect the tractor owners who are most likely to need these safety devices.
2006年，开展了一项社会营销活动，以增加纽约无防护拖拉机上翻车保护结构（ROPS）的安装量。利用从该项目热线收集的数据，研究了价格上涨对农民购买ROPS兴趣的影响。获取了自2006年以来美国市场上所有刚性ROPS套件的定价数据。这些数据被分为两组ROPS供应商：（1）为自己生产的拖拉机销售ROPS的拖拉机制造商，在本研究中称为原始设备制造商（OEM），以及（2）售后市场（AM）ROPS供应商。将价格上涨趋势与消费者价格指数（CPI）的变化进行对比，估计了成本五等分区间内进行改装的概率，并绘制了ROPS价格随时间的增长情况。在研究的六年中，OEM的ROPS套件平均价格涨幅（不包括运输和安装费用）为23.3%，而AM为60.5%（p<0.0001）。OEM的自付费用保持稳定，而AM的自付费用在六年内增加了203美元（p=0.098）。农民进行改装的概率从最低ROPS成本五等分区间的66.9%单调下降到最高区间的23%。如果这些趋势持续下去，到2020年，AM ROPS因咨询而进行ROPS改装的比例将降至20%以下。根据文献中确定的其他趋势，有理由假设ROPS安装量的减少可能会影响最需要这些安全装置的拖拉机车主。
