Aug 11, 2014 07:28
9 yrs ago
English term
unclear pronoun reference
English
Medical
Medical: Health Care
clinical trials
Subjects will be eligible for screening into this trial if they: Completed and transferred from the double-blind Trial XXX (12-month period including post‑treatment follow-up, regardless of whether this was on-treatment or off-treatment)
[what does the pronoun "this" refer to? ]
[what does the pronoun "this" refer to? ]
Responses
4 +5 | this = the double-blind trial | Tony M |
4 +8 | the 12 month period | Terry Richards |
3 -3 | this means | vivioliveira |
Responses
+5
14 mins
Selected
this = the double-blind trial
It has to refer back to the actual trial itself, as that's the only thing that would be either on- or off-treatment. It would probably have been clearer if they'd written "...and regardless of..."
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Note added at 15 heures (2014-08-11 22:50:42 GMT)
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I think it is a red herring to discuss the notion of placebos being 'treatment' — what is crucial here is the 'active treatment', which is what I'm sure is meant here; placebos are administered, but it can hardly be considered 'treatment' — at least, not once the blind has been lifted.
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Note added at 15 heures (2014-08-11 22:50:42 GMT)
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I think it is a red herring to discuss the notion of placebos being 'treatment' — what is crucial here is the 'active treatment', which is what I'm sure is meant here; placebos are administered, but it can hardly be considered 'treatment' — at least, not once the blind has been lifted.
Peer comment(s):
agree |
P.L.F. Persio
5 mins
|
Thanks, Miss!
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|
agree |
Maria Fokin
19 mins
|
Thanks, Maria!
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|
agree |
B D Finch
: As we are told that "the double-blind Trial XXX" was "for a 12-month period including post‑treatment follow-up", effectively the answer is both. However, the sense dictates that "this" should refer to the primary descriptor.
22 mins
|
Thanks, B! :-)
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|
agree |
Yvonne Gallagher
: with B
1 hr
|
Thanks, G!
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neutral |
Victoria Britten
: It can of course cover both; however, the placing of the brackets indicates to me that it was the 12-month period that the author had specifically in mind.
2 hrs
|
Thanks, Victoria! Yes, of course it could; but to my way of thinking, the brackets simply enclose 2 things that qualify the eligibility of the trial subjects — but these 2 things do not qualify each other.
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agree |
Craig Meulen
4 hrs
|
Thanks, Craig!
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4 KudoZ points awarded for this answer.
Comment: "Thank you!"
+8
7 mins
the 12 month period
That's the way I read it.
In fact, I don't see any other way of reading it.
In fact, I don't see any other way of reading it.
Peer comment(s):
agree |
JaneD
: Yeah, "this" refers to the 12 month double-blind trial
1 min
|
neutral |
Tony M
: As Jane says, Terry, it's really the trial, not the time period per se. Unlike a 'subject', a 'time period' cannot really and truly be said to be 'on- or off- treatment', if you see what I'm driving at?
7 mins
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I see your point but I feel that, in this context, the period and the trial are synonymous. Anyway, a trial can't be on- or off-treatment either, only the patient can be.
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agree |
Maria Fokin
26 mins
|
agree |
Jack Doughty
44 mins
|
agree |
Zsofia Koszegi-Nagy
1 hr
|
agree |
writeaway
1 hr
|
agree |
Duncan Moncrieff
: The text in brackets can stand by itself, "this" refers to the 12 month period. Of course the bracket text indicates the completion conditions for the double-blind trial.
1 hr
|
agree |
Victoria Britten
: Assuming the brackets are placed deliberately!
2 hrs
|
agree |
Rachel Fell
15 hrs
|
-3
21 mins
this means
I believe this reffers to another trial, in other words, non double-blind trial, having or not completed it.
Peer comment(s):
disagree |
Tony M
: Since there is no mention of any other trial in the sentence leading up to the pronoun in question, it cannot possibly mean this.
11 mins
|
disagree |
B D Finch
: Why should it mean that?!
12 mins
|
For my understanding, the first sentence would not be talking about the same trial
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|
disagree |
Yvonne Gallagher
: with others
1 hr
|
Discussion
But why focus on the follow-up? Because a lot of studies I’ve found exclude anyone who has recently participated in another study and taken a certain drug for a period of between, say, 30 days and a few months before the new screening – that matches the period of the possible follow-up quite well but not the entire trial period of 12 months.
In fact, I can’t seem to find a single(!) reference supporting the statement that placebos are classified as off-treatment (they also have on- and off-treatment periods):
“compared to placebo during the on-treatment period“
http://www.ncbi.nlm.nih.gov/pubmed/24718923
“In the year off treatment, spine BMD decreased significantly, but remained higher than baseline [...] and placebo [...]”
http://www.uptodate.com/contents/the-use-of-bisphosphonates-...
“Patients on placebo showed no difference in OT […] on and off treatment.”
http://www.ncbi.nlm.nih.gov/pubmed/24676931
“The 2 mL and 3 mL placebo treatment groups”
https://www.clinicaltrialsregister.eu/ctr-search/trial/2009-...
Who knows what the entire text says.
"patients participating in double blind placebo controlled trials of new medications are invited, on completion of the initial trial, to take the study drug for some further period."
http://jme.bmj.com/content/28/6/373.full
“In the open-label period (including safety follow-up)”
http://www.lundbeck.com/upload/trials/files/pdf/completed/10...
“Patients who completed the 12-week double-blind treatment period were proposed to participate in the open label period [during the follow-up period, I’d say] with eplivanserin 5 mg for an additional 40 weeks”
http://en.sanofi.com/img/content/study/LTE6262_summary.pdf
“A follow up open label study examined extended courses of etanercept in the same group of patients with AS, with the aim of “
http://ard.bmj.com/content/64/11/1557.full.pdf
“During a four-week double-blind sham-controlled phase and a subsequent 11-month follow-up open label period”
http://juser.fz-juelich.de/record/153725/?ln=de
Otherwise, the asker may end up not seeing the forest for the trees.
I've found sources to the contrary. Another one:
"Patients are randomized to receive either rhNGF at one of two doses or placebo, administered subcutaneously twice weekly for 18 weeks. Patients are stratified into three groups within their regimens by use of didanosine, zalcitabine, or stavudine as follows: current use vs. discontinued between 8 and 26 weeks before randomization vs. never used or discontinued use at least 26 weeks before randomization. Patients will assess their pain daily using the Gracely Pain Scale. AS PER AMENDMENT 5/6/97: After completion of the double-blind phase (18 weeks on treatment followed by 4 weeks off treatment), patients may receive open-label, active drug treatment according to their previously assigned regimen for an additional 48 weeks."
http://clinicaltrials.gov/show/NCT00000842
Off- and on-treatment refer to the same group, not two.
I'd rather read: "irrespective of whether the subjects were on or off treatment during the follow-up/after completion and transfer"
instead of
"irrespective of whether the subjects were on or off treatment during the 12 months/the trial"
The second still sounds to me as if the "subjects" possibly didn't receive any treatment at all - and I am sure that was not the case during trial XXX.
Consider: If someone dropped out, he or she would not be eligible anyway because of the non-completion of trial XXX. So why would I need another explanation in brackets?
To your second point: Yes, of course, thank you, I edited it. My mind must be wandering off...
Incidentally, re pronoun use: This (her painting her house pink) upset the neighbours.
Interested what others think.
"Each trial will enroll approximately 255 patients into a 48 week double blind period consisting of 6 cycles of 28 days on treatment with Pulmaquin or placebo plus 28 days off treatment, followed by a 28 day open label extension in which all participants will receive Pulmaquin (total treatment duration approximately one year)."
http://www.businesswire.com/news/home/20140430005538/en/Arad...
And further:
"Open label extension studies typically follow a double blind randomised placebo controlled trial of a new drug. At the end of the double blind phase, participants are invited to enrol in an extension study. The study will normally be longer than the randomised trial (two years is not uncommon but they often continue until the drug is licensed). All participants in the extension study are given the study drug, and both they and the investigators know this. The objective is primarily to gather information about safety and tolerability of the new drug in long term, day to day use."
http://www.bmj.com/content/331/7516/572
Thus, I'd say "this" refers to the verbs (completion + transfer) or "follow-up".
Note to your reply: Wouldn't it be "on treatment" without a hyphen then? That definitely threw me off.
A) "This" can refer to actions: She painted her house pink. This (her painting her house pink) upset the neighbors.
B) It's a list item (note the colon!)
C) Meaning: regardless of whether they completed and transferred from trial XXX off-treatment or on-treatment
Any thoughts on this (pardon the pun)? Wouldn't that make more sense?
In the same vein, the 12-month period may refer to the completion and transfer, not just the trial. Thank you!
I think this is inaccurately expressed, and that, as Tony suggests, "post-treatment follow-up" really means "post-trial follow up".
The meaning is effectively the same whether we interpret "this" as referring to the trial or the twelve-month period; effectively these two denote the same thing, and that is what it refers to.
Admittedly, it's a bit of a stretch to refer to a period of continuing treatment as "post‑treatment follow-up". But I could imagine a Statistician who was having a bad hair day, doing just that :-)
The context will probably rule this out!
Whether this does in fact make sense in the wider context or not I don't know, and suggest you wait until confirmation from a specialist in the clinical trials field.,