Table 2.

Analyses of MSN morphology at 21 days by linear models.

#	Response	Predictors		p Values 1
		First	Second	First	Second
1	TDL	Treatment	DA	3.362e−4	n.s.
2	BP	Treatment	DA	2.258e−5	n.s.
3	SL	Treatment	DA	5.357e−3	n.s.
4	TDL	DA	Treatment	2.711e−3	3.7215e−2
5	BP	DA	Treatment	1.494e−4	6.3311e−3
6	SL	DA	Treatment	9.064e−3	n.s.
7	TDL	BP	Treatment	<2e−16	n.s.
8	BP	TDL	Treatment	<2e−16	4.168e−3
9	TDL	Treatment	BP	1.187e−6	<2e−16
10	spines	Treatment	DA	5.948e−6	n.s.
11	spines	DA	Treatment	8.435e−4	3.245e−4
12	spines	TDL	BP	2.196e−9	n.s.
13	spines	BP	TDL	3.188e−6	6.618e−5
14	spines	BP + TDL	Treatment	4.139e−5	4.852e−4

¹ The first p value reports the comparison of the trivial fit to the fit with the first predictor. It therefore reports whether the first predictor contributes meaningful information. The second p value reports the comparison of the model with the first predictor to the model with both predictors. The second p value therefore reports whether the second predictor adds meaningful information to the model. Abbreviations: TDL, total dendritic length; BP, number of dendritic branch points; SL, segment length; DA, striatal dopamine concentration; n.s., non-significant.