Table 3. t-test analysis results by years of airline service

Variable	Years	Sample	Average	SD	F	p
안전운행(SM)	Below 1y	5	3.80	0.27	4.069**	0.008
	1-5y	81	3.22	0.70
	5-10y	48	2.82	0.70
	Above 10y	136	3.08	0.85
공정 및 자율보고(JC)	Below 1y	5	3.90	0.65	3.292*	0.021
	1-5y	81	2.72	1.12
	5-10y	48	2.43	1.08
	Above 10y	136	2.64	0.98

p<0.05,
p<0.01,
p<0.001.