Table 3.

Study 2: Depressive Symptoms and Positive Affect Regressed on Baseline Age, Time, and Data Collection Mode in the SATSA

	DV = Depressive Symptoms		DV = Positive Affect
Fixed Effects	Estimate	SE	Estimate	SE
Intercept	6.12***	0.32	8.15***	0.13
Gender (1 = female)	0.58**	0.21	0.08	0.08
Education	−0.19	0.23	0.26**	0.09
Chronic Health Conditions	0.79***	0.10	−0.18***	0.09
Mode (1 = IPTQ)	−1.17***	0.20	0.20*	0.10
Time	0.18***	0.02	−0.02*	0.01
Baseline Age	0.12***	0.02	−0.01	0.01
Baseline Age2	0.003	0.002	−0.001	0.001
Baseline Age × Mode	−0.04**	0.02	−0.005	0.007
Baseline Age2 × Mode	−0.003*	0.001	0.000	0.001
Time in Study × Mode	−0.09***	0.03	−0.01	0.01
Random Effects
Level 3 (Between Twin Pairs)
Intercept	8.94***	1.98	0.81**	0.31
Time	0.02*	0.01	0.002†	0.002
COV(Intercept, Time)	−0.30*	0.12	−0.01	0.02
Level 2 (Within Twin Pairs)
Intercept	14.75***	1.93	2.44***	0.36
Time	0.05***	0.01	0.002	0.002
COV(Intercept, Time)	−0.32*	0.13	−0.03	0.02
Level 1 (Within Persons)
Residual	18.04***	0.48	4.26***	0.11

Notes. For data collection mode, 0 = mailed questionnaires (Q) and 1 = questionnaires collected in-person (IPTQ). Gender is effect coded (−1 = male, 1 = female). Time refers to the number of years since the baseline assessment. COV refers to the covariance parameter between the specified random effects.

^†p < .10;

^*p < .05;

^**p < .01;

^***p < .001.