TABLE 7.

Results of ANOVA (number of trips/year).

Variables	Number of trips per year	N	F-value	p-value	Mean	SD
ATTABR	0∼1	425	8.102	0.000***	4.563	1.420
	2∼5	174			5.026	1.441
	6 or above	2			6.500	0.141
INTABR	0∼1	425	16.051	0.000***	4.096	1.452
	2∼5	174			4.787	1.464
	6 or above	2			6.400	0.283
ATTDOM	0∼1	33	6.316	0.002***	5.479	1.095
	2∼5	463			5.130	1.308
	6 or above	105			5.594	1.193
INTDOM	0∼1	33	0.940	0.391	5.232	1.303
	2∼5	463			5.220	1.268
	6 or above	105			5.406	1.233

**P < 0.05 and ***P < 0.01.