Table 5.

Multiple linear regression analyses of anterior frontal lobe ROI's age‐related change in D2‐like receptor availability (BP_ND) using [¹⁸F]Fallypride PET in Study 2

Model	Parameter	Anterior orbital gyrus	Anterior cingulate gyrus	Inferior frontal gyrus	Lateral orbital gyrus	Middle frontal gyrus	Superior frontal gyrus
	N	129	130	128	125	124	121
Baseline	R 2	0.354***	0.48***	0.488***	0.284***	0.394***	0.683***
Linear	Age	−0.0063 [−0.0093, −0.0034]	−0.0037 [−0.0056, −0.0018]	−0.0059 [−0.0085, −0.0033]	−0.0082 [−0.011, −0.005]	−0.0068 [−0.0095, −0.0042]	−0.0033 [−0.0053, −0.0013]
	R 2 change	0.079***	0.052***	0.071***	0.122***	0.109***	0.027**
Quadratic	Age	−0.035 [−0.053, −0.018]	−0.014 [−0.026, −0.003]	−0.035 [−0.05, −0.02]	−0.038 [−0.056, −0.019]	−0.034 [−0.049, −0.019]	−0.023 [−0.034, −0.012]
	Age2	0.00031 [0.00012, 0.00049]	0.00011 [−5.9e−06, 0.00023]	0.00031 [0.00015, 0.00046]	0.00031 [0.00012, 5e−04]	0.00028 [0.00013, 0.00044]	0.00021 [8.9e−05, 0.00032]
	R 2 change	0.045**	0.013	0.049***	0.046**	0.048***	0.027***

Notes. Significant effects are denoted in bold. Full regression tables can be found in the online application http://13.58.222.229:3838/agebp/.

*p < .05. **p < .01. ***p < .001.