"sample size was insufficient" is correct and can be used in written English
An example of when this could be used is, "Our sample size was insufficient to draw any valid conclusions."
Although the sample size was insufficient to demonstrate a statistically significant difference between the two arms, this study supports the potential effectiveness of pedometer interventions [31].
For the rare indel alleles the sample size was insufficient to impart statistical power and here we merely note that the "+9nt" variant occurred in the single Navajo-Churro animal tested, and that 3 out of 4 of the "–12nt" polymorphisms occurred in Finn animals, with the fourth in the "composite" (Suffolk-Hampshire-Columbia) stock (Table 2).
Furthermore, the sample size was insufficient to determine effects of gender on loss of ROS generation.
The sample size was insufficient to estimate utilities beyond age and gender categories.
Finally, the sample size was insufficient for matching SOFA and APACHE III scores among the patients with and without cirrhosis.
Gene expression analysis by phenotype was not performed as control group sample size was insufficient (n = 4).
In this case, the sample size is insufficient to obtain a statistically white X-ray image; an increment in the penetration power of the X-photons occurred and thus causes a lower photonic attenuation.
This study was not specifically designed to examine age related acquisition of immune responses and the sample size is insufficient to disprove observations from previous studies that showed that sexual stage immune responses do not increase with age [23], [24], [39].
*findings suppressed when sample size is insufficient to guarantee anonymity.
This observation may be due to the cumulative sample size being insufficient to detect a significant difference in this category.
However, this approach is very inconvenient and the performance of each binary logistic model might be degraded when sample size is insufficient.
