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Can you define lower here?
In my experience, they're most effective for higher frequencies (voices and higher), as lower frequencies are hard to attentuate (why we can hear/feel subwoofers from cars a fair distance away).
For example, a couple pairs I have are ineffective against the bass from the gym idiots running the aerobics room (wtf does it have to be loud outside the room - those women must be getting hearing damage), but it's great for all the people talking, and some of the tvs.
I don't know the exact frequencies but it's something I read and noticed myself, and wikipedia seems to agree.
(Don't know what that means.)
Personally I used the Sony XM3 a lot, on planes etc. which have great ANC, and I also used the Moondrop Blessing 3 which are just normal IEMs with no ANC and I only notice a difference in the low frequencies, you can also see that in the rtings measurements (XM3, Blessing 3), isolation in mids and treble is about the same, they seem to consider anything under around 250Hz as bass.
Yea, that "low frequencies" is rather ambiguous.
I could see over-the-ear headphones being better at "lower" frequencies than in-ear, both from material absorption and speaker size. Every ANC pair I've had, of any style, was pretty good at nearly eliminating the higher frequency noise while flying (engines, airflow noise, etc), and almost eliminated voices.