TABLE 3.

Pearson correlation matrix for working students (below the diagonal; n = 97) and non-student employees (above the diagonal; n = 74), means and standard deviations in the Japanese sample (N = 171).

	1	2	3	4	5	Mws (Mnse)	SDwe (SDnse)
(1) Intrinsic motivation	–	0.69	0.36	0.48	0.60	3.26 (3.45)	0.72 (0.81)
(2) Extrinsic motivation	0.65	–	0.38	0.58	0.81	4.00 (4.20)	1.09 (1.14)
(3) HWI-TC	0.14	0.12	–	0.50	0.30	2.47 (2.50)	1.36 (1.36)
(4) HWI-WI	0.46	0.55	0.50	–	0.62	3.79 (3.96)	1.09 (1.17)
(5) Job engagement	0.45	0.81	0.15	0.71	–	3.99 (4.10)	1.04 (1.06)

All correlations are significant at p < 0.001, apart from bolded correlations, which are non-significant (p > 0.05). HWI-TC, time commitment dimension of heavy work investment. HWI-WI, work intensity dimension of heavy work investment. An indication of ws in the mean and standard deviation columns = working students’ group. An indication of nse in the mean and standard deviation columns = non-student employees’ group.