A Checklist Cut ICU Infections to a Median of Zero. Ontario's Mandated One Barely Moved Surgical Deaths.
Michigan's ICU checklist, the WHO surgical checklist and Ontario's mandated one got very different results. What separates them applies to any morning list.
In this article12 sections
On October 30, 1935, a Boeing Model 299 bomber took off from Wright Field in Ohio, climbed steeply, stalled and crashed. Both pilots were experienced, and the cause was a control lock that had not been released before takeoff. One newspaper called the airplane “too much airplane for one man to fly.” The Army’s test pilots answered with a card listing the steps for takeoff, flight, landing and taxiing. Gawande tells the story in The Checklist Manifesto (2009), and the point for this article is that nobody on the card was being taught anything: it was written for experts who already knew every step.
A checklist helps when someone on the team is allowed to halt the work if a step is skipped, and it does little when it is a form to be filled in. That is the best reading of three large medical studies that tested checklists and got very different results, and it has consequences for anyone with a list of morning habits taped to a mirror.
What did the Michigan ICU checklist change?
In the mid-2000s, Peter Pronovost of Johns Hopkins and colleagues worked with more than 100 intensive care units in Michigan on one problem: bloodstream infections from central venous catheters. The checklist had five steps, all long-standing recommendations. Wash hands. Use full-barrier precautions when inserting the line. Clean the skin with chlorhexidine. Avoid the femoral vein when possible. Remove lines that are no longer needed.
The steps were old. The program gave nurses the standing to stop a procedure if a doctor skipped one, and managers backed them when they did. In Pronovost et al. (2006, New England Journal of Medicine), the median infection rate fell from 2.7 per 1,000 catheter-days before the program to zero within three months, and the improvement held for the 18 months the study followed.
It was a before-and-after comparison with no control group, so infections may have been drifting down for other reasons as well. But the drop was steep, and it came from people who had known the steps for years. The reason they were skipped is documented. In 2001 at Johns Hopkins, Pronovost asked ICU nurses to observe doctors inserting central lines for a month, and they found that in more than a third of patients at least one of the five steps was skipped. Nobody was ignorant of the list; time pressure got in the way, and a paper list had not stopped it.
What happened when eight hospitals tried the WHO checklist?
Gawande’s team at Harvard and the World Health Organization tested a 19-item surgical safety checklist. Haynes et al. (2009, New England Journal of Medicine) enrolled hospitals in Toronto, New Delhi, Amman, Auckland, Manila, Ifakara (Tanzania), London and Seattle. They compared 3,733 patients before the checklist with 3,955 after. Major complications fell from 11.0 percent to 7.0 percent, and inpatient deaths from 1.5 percent to 0.8 percent.
The checklist was read aloud at three pauses: Sign In before anesthesia, Time Out before the incision, and Sign Out before the patient left the room. The items include confirming the patient’s identity and the site of surgery, checking the anesthesia equipment, and counting instruments and sponges before closing. Everyone in the room heard the list, and anyone in the room could object.
Why did Ontario’s mandated checklist show almost nothing?
Ontario required hospitals to adopt a surgical checklist and report on its use, which gave Urbach et al. (2014, New England Journal of Medicine) a natural experiment covering 101 hospitals. Comparing the period before and after, they found deaths in hospital or within 30 days of surgery at about 0.71 percent and then about 0.65 percent, a difference that was not statistically significant, and complication rates that barely moved (roughly 3.9 percent in both periods).
The authors and later commentators pointed to how teams used the list, not its presence, as the likely reason. A hospital can say it uses the checklist when one person ticks boxes in the corner of the room, and the study could not see inside the operating room. I cannot say from the paper alone how much of the gap is poor use and how much is that Ontario’s starting death rate was already lower than at some Haynes sites, which would leave less room to improve.
What separates the versions that worked?
Put the three side by side and three questions sort them:
- Can someone other than the person doing the work stop it? In Michigan, a nurse could halt a physician. A tick-box form gives nobody that standing.
- Is the list said aloud at a fixed pause? The WHO version was spoken at three moments, with everyone present. Silent completion at a desk lets steps be assumed rather than checked.
- Does anyone outside the task see whether the steps happened? Michigan’s units reported infection rates back to staff. Compliance that nobody counts decays.
The three questions fit all of the results above, and none of the three required a better list, only a different relationship between the person and the list. They are my reading of the studies, not a published model.
What does this mean for a morning checklist?
Most personal checklists fail all three questions. The list is on a phone or the fridge. Nobody else can stop you from skipping step four. It is not said to anyone. The only person who sees whether you did it is the person who benefits from saying yes. By the logic of the medical studies, that is the Ontario version: present on paper, absent where it counts.
Scoring a few common setups against the three questions makes the gap visible:
| Setup | Someone can stop you | Said aloud at a fixed time | Someone sees the result |
|---|---|---|---|
| Paper list on the fridge | No | No | No |
| Habit app with a private streak | No | No | No |
| Text to a friend at 6:45 saying “up” | Weakly | Sort of | Yes |
| A friend who watches a video and can call you | Yes | Yes | Yes |
The third row is the cheapest upgrade, and the last row is the one that resembles a hospital team. The table is a sorting aid.
There is a counterintuitive consequence. Adding steps to a solo list should not help, because the steps were never the weak point. Adding one person who can check the result and speak up about it should. A friend who answers “did you do it?” is the nearest household equivalent of Pronovost’s nurse. Without that person, a list slides into routine as theater, with yourself as the only audience. And a routine that breaks on a given morning often has nothing to do with the list: a breakdown of alarm failures that are not about willpower covers the rest.
How could you run the three questions at home?
Start with the second, because it is free. Pick one moment, say the moment your feet touch the floor, and say the first item aloud to a person or into a message instead of ticking it silently. Then handle the first question by choosing someone who is allowed to say “stop,” which in a household might mean a partner who will tell you the list is not done when you are heading for the door with step three skipped. Last, make the result visible to someone other than you: a timestamped message, a shared note, a video. A hospital would call this a time-out. The name matters less than having a moment where somebody else can interrupt.
What would a fair test of a morning list look like?
It would be small and dull. Take 200 adults who want to be out of the house by 7:30. Give one half a written list. Give the other half the same list plus one named person who sees a daily yes or no. Measure on-time departure from something neither group controls, such as a building badge log or a commute app timestamp, and not from self-report. Run it for eight weeks, so the novelty has time to wear off.
My prediction, for what it is worth, is that the witnessed group would beat the list-only group, and that the list-only group would look like the Ontario hospitals. I could be wrong. I have not seen anyone run the experiment that would settle it, and until then the hospital data is the nearest evidence available. Surgeons and ICU nurses work in teams under legal and professional pressure, and a bathroom mirror is a different place; what I am offering about homes is an inference.
A side note on DontSnooze. The app speaks to the third question: the video you record after the alarm goes to friends who can see it, and a miss costs something. It does not supply the list. Write the steps down and let the video stand for the first one.
If a friend goes quiet on you, what happens when a witness stops answering covers the fallbacks. The hospitals found the same thing from the other side: a stop rule nobody enforces becomes a form.
Frequently asked: checklists, evidence and mornings
Do checklists actually work?
Sometimes, and the evidence splits by how they are used. In Pronovost et al. (2006, New England Journal of Medicine), 103 Michigan ICUs saw the median bloodstream infection rate fall from 2.7 to 0 per 1,000 catheter-days with a five-step list that nurses could enforce. Urbach et al. (2014, same journal) found no significant change in Ontario surgical deaths after hospitals were required to adopt a checklist.
What is on the WHO surgical safety checklist?
It has 19 items spread across three pauses: Sign In before anesthesia, Time Out before the incision, and Sign Out before the patient leaves the operating room. Haynes et al. (2009, New England Journal of Medicine) tested it in eight hospitals in eight cities and saw major complications fall from 11.0 to 7.0 percent and inpatient deaths from 1.5 to 0.8 percent, with no separate control group.
Why would the same checklist work in one place and not another?
The studies cannot prove a cause, but the best-supported explanation is use. A list read aloud at a fixed pause, with a team member empowered to stop the procedure when a step is skipped, behaves differently from a form completed after the fact. Ontario also started with a lower death rate, 0.71 percent, than the 1.5 percent in the Haynes hospitals, leaving less room to improve.
Does this apply to a personal morning checklist?
Only by analogy. No trial has tested a household morning list against a witnessed one. The medical results suggest that a list alone is the weaker version, and that someone else who can check the steps and speak up when one is skipped is the part worth copying.