3/ restrictions, covering: activity limitations, mask requirements or prohibitions, & vaccine requirement or prohibitions. Key findings are that if all states had adopted restrictions similar to the 10 most restrictive states, there would have been 271 and 447 thousand fewer deaths

4/ there would have been 271 and 447 thousand fewer deaths than if all states had restrictions similar to the 10 least restrictive states. Behavior changes probably played an important explanatory role.