a world of difference phrase : to cause a change : to be important in some way

well-being – n. the state of being happy, healthy, or prosperous

survey – n. an activity in which many people are asked a question or a series of questions in order to gather information about what most people do or think about something

chronic medical adj. continuing or occurring again and again for a long time

spouse – n. someone who is married : a husband or wife

test of time phrase : to continue to be important, respected, etc., for a long period of time