Skip to main content

Table 1 Possible outcomes of a dual analysis process

From: Reporting phenotypes in mouse models when considering body size as a potential confounder

Row

A1

A2: + weight

Conclusion

Insight

1

+

-

Absolute phenotype ∆

No longer significant–confounded by BW

2

-

-

No abnormality

 

3

-

+

Relative phenotype ∆

Adding weight increases sensitivity to detect ∆

4

+

+

Absolute phenotype ∆ and relative phenotype ∆

Two scenarios

1. BW difference: still there is a significant ∆ as ∆ larger/smaller than expect for BW difference

2. BW same: a significant ∆. Weight explains variation but does not lead to phenotype difference.

  1. Possible outcomes when assessing for a genotype effect for a variable of interest when the analysis excludes (A1) or includes body weight as a covariate (A2). In this table, + indicates a statistically significant genotype effect;−indicates a non-significant genotype effect; ∆ indicates change; BW indicates body weight