Two reasons it's useless and harmful:
1. The aim is wrong. It's intended to be used in the old style rehab clinics that use 'goal setting' and 'treatment planning', as part of a suite of long questionnaires to enable them to show their rehab works.
From the document that comes with the questionnaire:
2. The questions are badly worded and make no sense. They take no account of the cumulative effect of activities, or how often you can do each activity, and they lump together 'adjustments that could be as little as using a cushion to support you sitting, to sitting for only a minute instead of half an hour.
It's useless and very concerning that the MEA is still supporting such rubbish, and explicitly expecting the NHS to continue providing rehab clinics instead of physician led services.
"The aim is to identify, understand and quantify people’s symptoms and disabilities.
It will also support goal setting, treatment planning, and monitor changes.
The aim of this questionnaire is to measure activity levels, and ask about the adaptations you may make to manage your symptoms and/or energy levels."
From the section I have read so far it cannot do any of these things without being gross misrepresentations due to the wording and limitations.
1. It can't and doesn't attempt to 'measure activity levels' because it takes no measure of what people 'have done in a month or even a day'.
It could not do that for a healthy person - who will have other things on their plate too and might also find that one of the activities has to increase for reasons that have nothing to do with them being able to or choosing to, such as if their car broke down or their employer close their car park to them, which means if that becomes a main measure it misrepresents their activity as increasing when they might have had to stop socialising, grocery shopping as much etc or now can only work 4 days a week
2. It therefore can't measure changes, Because it isn't accurate to begin with and isn't 'measuring the gap directly' (which is what good clinical care should be doing anyway), but yes is about rehab and the tyranny of using data to focus on 'if people are behaving right' in the classic no-win conundrum - imagine a normal healthy person being forced to fill out something where they get blamed and told they are tired because they are stupid and did too much or blamed and told they are tired because they are stupid and did too little. Because this isn't a clinical tool and I haven't seen any discussion from them of where there is either science or discussion of the illness or condition.
even if the illness was 'about behaviour' - which we all need to keep remembering it isn't and its pretty bad that rather than this being a measure of 'physical function' ie the SF-36 this is a ploy to replace (from Crawley et al 2013) - but any
medical clinic would be measuring actual health outcomes over a long period which this would be a part of and done in a completely different way as a triangulation to eg show people getting more disabled at the same time as iller from having to do too much.
It seems to obsess over a compulsion 'it's their behaviour'
not an illness and the outcome of this thinking is to attack people's mental health and health through inappropriate micro-scrutiny and violating their privacy on the most intimate thing you can 'the very minutia and ins and outs of their life and being and body' with intrusive questions, for no explainable justification to decide it is entitled to this intrusion.
3. It can't make up its mind on defining what 'an average day' is and does not make it clear. What if a person is stuck in rolling PEM with no choice what they have to do in a day due to work or childcare - doesn't PEM not matter? Are they going to be looking at the 'impact/long term health outcome' of such activity? Context matters.
ANd due to this ambiguous wording then there is a validity issue and internal consistency across different people and maybe even within individuals if someone was to be expected to fill it in repeatedly, there is no reason why I would necessarily even if I read it in the morning then later in a day would come to the same conclusion about what counted as 'average day' whether it was the few 'non-PEM, non-pushing' days or actually if most of my days are in PEM that month then that is average - and you need to know what the other measures will be to know the context of it
so if they are using something else to find out you've declined and are asking if you've been in PEM most days is that on the actual output? or are they being cheeky and instead of the proper interpretation of realising if your average day was PEM for the month and the previous month was doing 'too much' then the reason for the lower activity is overdoing it last month, rather than twisting the data to say you feel tired because you do less etc.
4. agree on the adjustments - how long is a piece of string. What usefulness is that? FUNCAP is specifically about
how adjusted something has to be for example and then
how little someone can still do of it in a month. ie it focuses on the cardinal disability of ME/CFS (overall envelope, pushing over threshold means PEM and deterioration). Where this seems to be doing the opposite and burying these 2 as buckets.
So no, it can't help with either adjustments or the disability associated with ME/CFS because it is burying them from what I can see by measuring them in fuzzy buckets and deliberate ceiling and floor effects that are at off the scale levels - if someone would get 'no change' if their disability took them from only being able to sit with a cushion to only being able to sit for one minute.
Can you imagine the impact that would have at the micro-level if someone was communicating with an employer and could only sit for one minute but it was getting treated as if they just needed a cushion?
And then multiply that, bigotry-wise to the macro-scale for a seriously debilitating illness where even those who might be mild now need to be aware they are not immune from ending up severe/very severe if pushed too hard, and yet the orthodoxy has been to lie to them in order to trick them into working themselves there whilst their body screams.