Table 2.

Linear regression models for the effects of lighting treatment, sex and their interaction on the first three principal components explaining variation in central nervous system volumes.

predictors	estimate ± s.e.	statistic	p‐value
(a) PC1: secondary visual pathway and rest of central nervous system
lighting treatment	−0.33 ± 0.60	F 1,25 = 0.02	0.89
sex	−1.46 ± 0.79	F 1,25 = 3.45	0.08
lighting × sex	0.85 ± 1.08	F 1,25 = 0.63	0.44
(b) PC2: primary eyes visual pathway
lighting treatment	−1.30 ± 0.40	F 1,25 = 10.07	0.004
sex	0.59 ± 0.53	F 1,25 = 8.05	0.009
lighting × sex	0.80 ± 0.72	F 1,25 = 1.23	0.28
(c) PC3: male-biased (AB+MB) versus female-based (AM2) structures
lighting treatment	0.10 ± 0.42	F 1,25 = 0.23	0.63
sex	1.18 ± 0.56	F 1,25 = 11.63	0.002
lighting × sex	0.21 ± 0.76	F 1,25 = 0.08	0.78