the likelihood of attendance increased when group members who, on average, rated sessions as being low in engagement uncharacteristically rated a previous session as high in engagement.
참여의 가능성은 증가한다. 이전 회기 치료의 참여가 낮았다고 평가한 그룹 멤버들은?
여기서부터 꼬입니다. ㅠㅠthe likelihood of attendance also increased when group members who, on average, rated sessions as high in engagement uncharacteristically rated the previous session as low in engagement.
위에랑 비슷한 문장 같습니다.