Silke
☆    

Germany,
2020-03-24 09:52
(1517 d 23:39 ago)

Posting: # 21297
Views: 3,059
 

 protocol amendment that may trigger Group effect test [General Sta­tis­tics]

Dear Helmut,

Situation:
1st period was dosed in 1 group and completed in CRO 1
2nd period must now be performed at a different CRO (CRO 2)
2nd period must be performed in 2 groups in CRO 2

Protocol amendment:
Switch in CRO including all tasks
due to the change of dosing in 1 group to 2 groups in period 2 the washout will be different between the two groups.

Does this trigger the evaluation of a group effect, although the groups may only be separated by 1 week?

Is there special statistics we need to consider to address this properly?

Thanks :-)

kind regards,
Silke
ElMaestro
★★★

Denmark,
2020-03-24 10:07
(1517 d 23:23 ago)

@ Silke
Posting: # 21298
Views: 2,374
 

 protocol amendment that may trigger Group effect test

Hi Silke,

❝ Situation:

❝ 1st period was dosed in 1 group and completed in CRO 1

❝ 2nd period must now be performed at a different CRO (CRO 2)

❝ 2nd period must be performed in 2 groups in CRO 2


That's annoying :-)

❝ Protocol amendment:

❝ Switch in CRO including all tasks

❝ due to the change of dosing in 1 group to 2 groups in period 2 the washout will be different between the two groups.


❝ Does this trigger the evaluation of a group effect, although the groups may only be separated by 1 week?


❝ Is there special statistics we need to consider to address this properly?


In my opinion it is not overly informative to do a group analysis here, at least not within the fit which provides for the evaluation of BE (here it is a kind of "accidental group within period within CRO", where period somehow is indistinguishable from CRO :surprised::ponder:).

Can you switch the volunteers to the other CRO, or has it become a parallel trial rather than a crossover trial by now?

Pass or fail!
ElMaestro
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