It is one of the most consistent findings in modern health services research: people who have an ongoing relationship with a primary care provider live longer, spend less on care, and end up in the hospital less often. The effect is not small.
What the studies actually show
A 2019 analysis in JAMA Internal Medicine found that every additional ten primary care physicians per 100,000 people was associated with a 51-day increase in life expectancy. Other work has linked continuity of care — seeing the same clinician over time — to lower mortality across nearly every setting studied.
Why it works
The mechanism is not glamorous. A clinician who knows you catches small changes earlier. They titrate medications instead of adding new ones. They know when a symptom is new and when it is your normal. They keep the specialists in conversation with each other.
What continuity looks like in practice
It looks like a phone call returned the same day. It looks like a note that references what you were worried about last spring. It looks like knowing your mother's history without having to re-explain it. Small things, repeated for years — that is the intervention.
