I think your searching skills surpass mine, @Wickedlittledancer
2.5mg is a non-therapeutic dose, let's say. However, regardless of what it is labelled, on every trial, people lost weight on that dose. In the real world, many people continue to lose weight on that dose if they stay on it past the first 4 weeks, as each person's individual circumstances and response will clearly vary.
We know that 2.5mg weekly on treatment initiation for the first 4 weeks will result in more weight lost than placebo. It is clear that continuing on 2.5mg would likely result in more weight lost than placebo, on average.
If people want to continue on 2.5mg because they are losing weight consistently, then it is effective for them, despite not being considered a therapeutic dose level. I don't see the point in telling people that it's not a therapeutic dose level, if it's producing consistent weight loss for them. It's an irrelevant bit of information, as it's not about them as an individual.
I agree that taking a dose of 2.5mg or less every 4, 6 or even 9 weeks apart is fairly pointless, as you will never be on a stable dose and all the medication will be out of your system before the next injection. You'll get a week of noticeable effects and then negligible impact for the rest of the time.