To determine marital satisfaction and success, Glenn says, the answers to a series of questions were calculated according to a statistical index, including adjustments for the length of marriages as well as the age at first marriage.

• 葛兰说，为了确定婚姻是否幸福和成功，这套调查问卷的答案是根据统计指数来计算的，包括婚姻持续时间和首次结婚年龄。