First step of the assessment of observer agreement: Pairwise percent agreement on whether an item was discussed/available (i.e. rated “0” or not).

First step of the assessment of observer agreement: Pairwise percent agreement on whether an item was discussed/available (i.e. rated “0” or not).观察者一致性（observer agreement）评估的第一步：针对某一条目是否被讨论/存在（即被评定为"0"或未被评定为"0"）的两两百分比一致性。