The low estimates may count only executions and labor camp deaths as instances of killings by communist regimes while the high estimates may be based on the argument that communist regimes were responsible for all deaths resulting from famine or war.
较低的估计可能仅仅计算了被处死及死于劳改营的人数以作为共产主义政权杀害性命的实例，同时较高的估计可能是基于所有对共产主义政权对造成饥荒和战争的责任的争议。