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一九八七年七月作者用无蟑螂害标准考核庐山区牯岭镇室内蟑螂侵害水平的四项指标大大低于“双5”和“双2”标准,可以确认属于无蟑螂害地区。调查数据经卡方检验,发现海拔350米以下和1000米以上蟑螂侵害率的差异具有高度显著性,海拔350米以下的山南和山北蟑螂侵害率的差异没有显著性。
In July 1987, the four indicators of the level of indoor cockroach encroachment in Chongling Town, Lushan District were significantly lower than those of “Double 5” and “Double 2” criteria by using the standard of no cockroach harm, confirming that it belongs to the area without cockroach. The chi-square test showed that there was a significant difference in the infringement rate of cockroaches below 350 meters above sea level and above 1000 meters. There was no significant difference in the infringement rates of Shannan and Shanbei cockroaches below 350 meters above sea level.