The phrase "a significant effect when" is correct and usable in written English.
It can be used in contexts where you are discussing the impact or influence of one factor on another, particularly in research or analytical writing.
Example: "The study revealed a significant effect when the variable was altered, leading to unexpected results."
Alternatives: "a notable impact when" or "a considerable influence when".
And according to a recent poll by CBS News, spouses have a significant effect when voters are deciding whom to support.
But talking about an animal that was 12 metres or 16 metres long rather than 14 metres and that both sounds like a major difference and could have a significant effect when scaling things.
These features will have a significant effect when comparing the predictions provided by the 1D map and the 2D map.
For the remaining P fertilisers, the applied BEs (Pro, RhVi and Bio-DC) did not have a significant effect when compared with the control.
Regardless, of the sample chosen, anger had a significant effect when examined with verbal aggression, physical aggression, weapon usage, and committing a violent sex crime.
Univariate analysis of clinical factors that contribute to the response demonstrated that IFN therapy had a significant effect when, (1) the serum HBV-DNA level was <200 Meq/ml prior to the commencement of IFN therapy (P=0.0327).
We do not observe a statistically significant effect when we split the sample between 'Movers' and 'Stayers'Stayers
Finally, the risk associated with lower statistical power is to fail to find a statistically significant effect when there is in fact one (type II error).
We observed a similarly significant effect when anti-H4 was added to the conditioned media, suggesting that histones also contribute to the stimulatory potential of necrotic cell supernatants (Fig 7A).
Alendronate in particular, shown to significantly increase spine, hip, and total-body BMD, thus helping to prevent fractures and height loss in osteoporotic men, (Orwoll et al 2000) has a more significant effect when compared with alfacalcidiol plus calcium supplementation (Ringe et al 2001), or with calcium supplementation alone (Gonnelli et al 2003).
Small steps perhaps, but we know that these programmes have a significant effect – and when parliament calls for the government "to introduce a role models and mentoring programme aimed at Muslim women to help them realise their potential in employment", I can't help but think they should come and talk to us.
