Saturday’s episode, Oxygen, had an Audience Appreciation (AI) figure of 83.
The Appreciation Index in an indication of how much viewers enjoyed the episode, based on the reactions of a selected panel of viewers, who rate the episode shortly after transmission.
The score of 83 is considered to be good, and it is in line with the average for the Capaldi era. It’s the same score achieved by The Pilot, Smile and Knock Knock (and one down on Thin Ice, whose score of 84 is the season high for the time being).
[Source: Doctor Who News]