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A new Stanford University study has found an "activity inequality" around the world — in countries with high rates of obesity, there is greater variation in the number of steps people walk each day compared to populations with lower rates of obesity. And, one of the biggest contrasts is between men and women. The study's findings, analyzed from smartphone step-count data from more than 700,000 people in 111 countries, should inform policies to curb obesity, researchers wrote.

Expand chart
Data: Activity Inequality Project; Chart: Andrew Witherspoon / Axios

Key findings:There's a gender gap: In every country studied by the researchers, men logged more daily steps than women. But in certain countries, such as Qatar and Saudi Arabia, results showed that men walked nearly 40% more than women. The U.S. also had one of the largest gender gaps, with men walking 25% more than women.Inactivity is worse for women than men, according to findings. Women who walked about 1,000 steps per day were more than 3 times as likely to be obese than women who walked about 10,000 steps. Similarly inactive men were less than twice as likely to be obese than their active counterparts. The obesity rate was 30% for both men and women who logged around 1,000 daily steps. Limitations: Smartphone algorithms and apps aren't entirely accurate at measuring steps, and researchers are limited by who can afford to use them. Data was therefore largely collected from relatively wealthy people, though smartphones are gaining popularity even in developing nations. Still, the study did not include low-income countries.

Go deeper: 2.2 billion people worldwide are obese or overweight.

Go deeper

Updated 5 hours ago - Politics & Policy

Coronavirus dashboard

Illustration: Eniola Odetunde/Axios

  1. Health: Most vulnerable Americans aren't getting enough vaccine information — Fauci says Trump administration's lack of facts on COVID "very likely" cost lives.
  2. Politics: Biden unveils "wartime" COVID strategyBiden's COVID-19 bubble.
  3. Vaccine: Florida requiring proof of residency to get vaccine — CDC extends interval between vaccine doses for exceptional cases.
  4. World: Hong Kong to put tens of thousands on lockdown as cases surge.
  5. Sports: 2021 Tokyo Olympics hang in the balance.
  6. 🎧 Podcast: Carbon Health's CEO on unsticking the vaccine bottleneck.

Trump impeachment trial to start week of Feb. 8, Schumer says

Senate Majority Leader Chuck Schumer. Photo: The Washington Post via Getty

The Senate will begin former President Trump's impeachment trial the week of Feb. 8, Majority Leader Chuck Schumer announced Friday on the Senate floor.

The state of play: Schumer announced the schedule after reaching an agreement with Republicans. The House will transmit the article of impeachment against the former president late Monday.

7 hours ago - Health

CDC extends interval between COVID vaccine doses for exceptional cases

Photo: Joseph Prezioso/AFP via Getty

Patients can space out the two doses of the coronavirus vaccine by up to six weeks if it’s "not feasible" to follow the shorter recommended window, according to updated guidance from the Centers for Disease and Control and Prevention.

Driving the news: With the prospect of vaccine shortages and a low likelihood that supply will expand before April, the latest changes could provide a path to vaccinate more Americans — a top priority for President Biden.