The proportion of interburst period duration to DGC duration in P. americana was the highest with the mean value 57%, which was 48%, 37% and 36% for B. germanica, P. brunnea and P. australasiae respectively.

• 对于爆发间期历时在整个DGC历时所占的比例,美洲大蠊最大,平均为57%25,德国小蠊次之,为48%25,褐斑大蠊和澳洲大蠊比较接近,分别为37%25和36%25。