The phrase "all pertained" is correct and usable in written English.
It can be used when discussing topics or subjects that are relevant or related to a particular matter.
Example: "The documents we reviewed indicated that all pertained to the ongoing investigation."
Alternatives: "all related" or "all connected".
The 296 emails all pertained to the 2012 terrorist attack on the United States consulate in Benghazi, Libya.
He asked for questions but they all pertained to the concerns about May's NATO and Group of 8 meetings.
Film director James Cameron's most interesting insights (and most tweeted quotes) all pertained to leadership and management.
All pertained to the individual level.
Various reasons were given for not starting treatment, but all pertained to different life circumstances of the individual participants and not to randomisation status.
On this film I was using different colored ink for each take, so that when Spike said, 'O.K., I want to match to Take 2,' I could go back and see all the notes that pertained to Take 2. I also Polaroid the heck out of everything.
Moreover, higher average weekly pertained to all intensity levels of physical activity (Table 4, Additional file 5) and was sustainable over time (Figure 2).
Knowledgeable, courteous, and patient, she clearly and simply answered all my questions that pertained to my specific needs and situation.
Three items pertained to self-efficacy beliefs regarding weight and physical activity management; one item pertained to social support in physical activity and two items pertained to outcome expectancies regarding weight and physical activity management.
"They wanted something that pertained to them," he said, "some comfort that pertained to their situations".
One attitude item pertained to current weight and one attitude item pertained managing weight.
