Table 4.

Hierarchical linear regression models on the mental component summary score of the SF-36v2.

	Model 1	Model 2	Model 3	Model 4	Model 5	Model 6
Gender (female vs. male)	−0.654	−0.481	−0.619	0.179	−0.347	−0.510
Age	0.193 **	0.198 **	0.182 **	0.182 **	0.183 **	0.196 **
Education level	0.624 *	0.615 *	0.819 **	0.893 **	0.880 **	1.082 **
Personal monthly income	1.455 **	1.388 **	0.945 *	1.124*	0.731	0.398
Smoking status (vs. non-smokers)
Ex-smokers		0.137	0.429	0.785	0.852	0.517
Current smokers		−0.195	0.300	0.288	0.574	0.086
Drinking status (vs. nondrinkers)
Abstainers		−0.574	−0.209	−0.347	−0.402	−0.057
Drinkers		1.513	1.528	1.368	1.207	0.625
Fresh fruit consumption frequency (vs. frequently)
Sometimes			−2.597 **	−2.456 **	−1.895 **	−1.214
Seldom			−3.233 **	−2.875 **	−2.304 **	−1.567 *
Have meals on time (vs. usually)
Sometimes			−3.916 **	−2.771	−2.173	−0.980
Seldom			−6.739 **	−5.127 *	−5.876 *	−4.523 *
Food control (vs. usually)
Sometimes			−3.756 **	−3.650 **	−2.904*	−1.878
Seldom			−0.072	−0.141	−0.143	0.268
Sleep on time (vs. usually)
Sometimes				−0.029	0.292	−0.183
Seldom				−1.134	−0.998	−0.940
Suffer from sleep disorders (vs. seldom)
Sometimes				−2.352 **	−2.283 **	−1.982 **
Frequently				−5.161 **	−4.980 **	−4.417 **
Take sleeping pills (vs. seldom)
Sometimes				−3.459 **	−3.305 **	−3.110 **
Frequently				1.036	1.060	0.981
Do physical exercise (vs. regularly)
Sometimes					−3.784 **	−2.576 **
Seldom					−3.152 **	−1.384*
Do housework (vs. usually)
Sometimes					−1.250	−0.854
Seldom					−1.569 *	−0.642
Physical labor participation (vs. usually)
Sometimes					−0.446	−0.006
Seldom					1.583 *	1.332
Individual sedentary pastime						1.252 **
Individual outdoor activities						2.362 **
Individual non-developmental interest						0.154
Developmental interest						0.444
Interactive entertainment						1.847 **
Travel						2.293 **
Constant	40.257 **	39.586 **	44.251 **	44.592 **	45.991 **	39.466 **
F value	13.740 **	7.416 **	8.399 **	10.371 **	10.170 **	11.603 **
R2 (adjusted)	0.039 (0.036)	0.042 (0.036)	0.080 (0.071)	0.134 (0.121)	0.165 (0.149)	0.218 (0.199)
R2 change	0.039	0.003	0.038	0.054	0.031	0.053

** p < 0.01; * p < 0.05.