TABLE 2—

Happiness Equations: Fixed-Effects Regression Models of Changes in “Been a Happy Person” on Changes in Fruit and Vegetable Consumption and Covariates. Longitudinal Survey Data on 12 385 Adults: Household, Income, and Labour Dynamics in Australia Survey, 2007 and 2009

Independent Variable	Model 1 (No Covariates)	Model 2 (Partial Set of Covariates)	Model 3 (Full Set of Covariates)
Fruit and vegetable portions/d, B (95% CI)	0.02 (0.01, 0.03)	0.02 (0.01, 0.04)	0.02 (0.003, 0.03)
Log of household income, B (95% CI)		0.02 (−0.02, 0.05)	0.02 (−0.02, 0.05)
Constant, B (95% CI)	4.35 (4.30, 4.40)	4.29 (3.40, 5.17)	4.31 (3.42, 5.20)
Other covariates included	No	Yes (a partial set)	Yes (a full set)
Overall R2	0.02	0.01	0.03
No. of individuals	12 360	12 360	12 360
No. of observations	20 054	20 054	20 054

Note. CI = confidence interval. Dependent variable is “been a happy person” (range = 1–6). The full estimation results (with a complete set of control variable coefficient estimates) are available in Table G, available as a supplement to the online version of this article at http://www.ajph.org.