Segmented regression analysis of changes in antipsychotic and other psychotropic prescription in relation to the 2004 and 2009 risk communications.

apbp*Value is the change in trend not the subsequent trend, and interpretation of the model should be in conjunction with examining the time trend graphs. For example, for oral antipsychotics the trend before the 2004 intervention is a rising one, with an increase of 0.61% per quarter. There is a statistically significant downward change in trend of 0.54% per quarter, so the post-2004 risk communication estimated trend is an increase of 0.07% per quarter. There is a further statistically significant downward change in trend of 0.51% per quarter after the 2009 risk communication, so the post-2009 risk communication estimated trend is a decrease of 0.44% per quarter.

apbp*值表示的是趋势的变化量，而非后续的趋势本身，对该模型的解读需结合时间趋势图进行综合分析。例如，就口服抗精神病药物而言，2004年干预措施实施前的趋势呈上升态势，季度增幅达0.61%。该趋势出现了每季度0.54%的具有统计学显著性的下行变化，因此2004年风险沟通后的估算趋势为季度增幅0.07%。2009年风险沟通后，趋势又出现了每季度0.51%的具有统计学显著性的进一步下行变化，故2009年风险沟通后的估算趋势为季度降幅0.44%。