Table 2.

Results of parallel trend test.

Variables	Ln (cost)
Treatment	–0.286a
1 month before	–0.016
Month of adoption	–0.196a
1 month after	–0.197b
2 months after	–0.276a
Title_dummy1	0.129
Title_dummy2	0.067
Title_dummy3	0.191b
Ln(Workload)	–0.071
Gender	0.257a
_cons	9.244c
R 2	0.097

^aP<.05.

^bP<.01.

^cP<.001.