From the article: “In the three months following testing positive for COVID-19, 1 in 5 survivors were recorded as having a first time diagnosis of anxiety, depression or insomnia. This was about twice as likely as for other groups of patients in the same period, the researchers said.”

I wonder if that means twice as likely as for some other groups of patients, or twice as likely as all other groups of patients.

I remember reading the Spanish flu caused cognitive impairment in some patients, too.