From the WaPo article above:
In third-grade reading — a critical year — 60.2 percent of Lewis-Palmer students were considered proficient in reading in 2021, up from 58.2 percent in 2019. During that same time, Colorado proficiency rates dropped from 41.3 to 39.1 percent.
The school district made even bigger gains in fifth grade. Nearly 75 percent of fifth graders were considered proficient in reading in 2021, up six percentage points from 2019. Colorado state dropped 1.2 percentage points during that time.
So (while its math proficiency levels dropped) reading proficiency levels went up slightly at one wealthy and high achieving Colorado district that was more open, while in the rest of the state saw a slight decrease in reading proficiency.
Interesting, I guess, but it’s not surprising that less wealthy, lower performing districts would not fare quite as well during covid, regardless of covid policies. These groups have tended to disproportionately impacted across the board. But is important to suss out the impact of covid generally vs. the impact of the remediating measures such as masking and/or online learning, and there was no effort to do that here. The slight drop in reading levels state-wide is not exactly strong evidence that districts which had more strict covid policies in place have horribly failed their children or irrevocably stunted their education.