Table 5.

Moderation of Effects of Alcohol Use Initiation on the Level of Multidimensional Personality Questionnaire Personality Traits by Age of First Drink

	Level 1 predictors					Level 2 predictors
Trait	Intercept (SE)	Age (SE)	Age2 (SE)	Age3 (SE)	Effects of initiation on trait level (SE)	Age of first drink on initiation effects (SE)	Age-specific initiation effects
							−1 SD	+1 SD
Well-being	56.51** (2.08)	0.27 (0.33)	−0.01 (0.03)	0.0001 (0.0008)	−7.01** (2.42)	0.30** (0.13)	−2.10	−1.58
Stress Reaction	50.05*** (3.60)	−1.53* (0.67)	−0.05 (0.04)	0.0004*** (0.00008)	9.15*** (2.53)	−0.47*** (0.14)	2.71	0.64
Alienation	59.20*** (7.77)	−6.83** (2.30)	−0.51* (0.21)	−0.01* (0.006)	11.01*** (2.68)	−0.54*** (0.15)	3.61	1.24
Aggression	55.54** (2.19)	−0.89* (0.35)	0.03 (0.03)	0.002* (0.0008)	3.55 (2.51)	−0.06 (0.13)	5.81	2.73
Control	15.19** (5.76)	6.11** (1.72)	−0.40(0.16)	0.009 (0.005)	−7.63*** (2.20)	0.36** (0.12)
Harm Avoidance	36.03*** (1.11)	−0.57 (0.39)	0.08* (0.03)	−0.002* (0.0009)	0.08 (2.79)	0.05 (0.15)	0.76	0.98

^*p < 0.05,

^**p < 0.01,

^***p < 0.001, with no adjustment for multiple testing.

N = 3,211. “Intercept” values reflect model-derived scores at age 11. Values for “age,” “age²,” and “age³” reflect the linear, quadratic, and cubic change, respectively, per year in that scale after the age of the intercept. “Age of first drink on initiation effects” reflects the effect of including age of first drink (centered) at Level 2 as a predictor of individual differences in the initiation effects at Level 1. This coefficient denotes whether the magnitude of the effect of alcohol use initiation on a trait level varied significantly as a function of the timing of alcohol use initiation. The “Age-specific initiation effects” gives the respective effects of alcohol use initiation on trait levels at 1 SD below and 1 SD above the mean age of first drink.