Table 1.

t-Test analysis for average travel time in the subway system

Year	$t_{st}<t_{sw}$	$t_{st}<t_{jh}$	$t_{st}<t_{hm}$	$t_{hm}<t_{sw}$	$t_{sw}<t_{jh}$
2011	2.0199*	6.7690***	0.4437	2.2983*	7.2125***
2012	3.0377**	6.8172***	0.3236	2.9955**	6.1161***
2013	3.3931***	6.6184***	1.3159	1.2549	5.4220***
2014	4.1547***	6.4971***	1.2041	2.0515*	4.7716***
2015	5.2661***	6.5101***	2.2643*	1.7364*	3.5064***
2016	5.4152***	6.3995***	2.5833**	1.5320	3.1390***
2017	5.1918***	6.9654***	2.2971*	1.7537*	4.1152***

t value is reported. ***$P<0.001$, **$P<0.01$, $*0.01\le P<0.05.$ st, sw, jh, and hm denote stayer, switcher, job hopper, and home mover.