Association of overtime work and obesity with needle stick and sharp injuries in medical practice

Table 5 Mediation effect of heavy overtime work and healthy body weight for needle stick and sharps injuries and the main effect

IV	Mediator factor
	Heavy OT work4							HBW5
	c	c’	a	sa	b	sb	Zm	c’	a	sa	b	sb	Zm
All participants
Doctors1	1.1a	0.8	1.6c	0.3	1.4b	0.5	2.5*	1.0a	-0.2	0.2	-0.7NS	0.4	0.8
Doctors effect
RD2	2.9b	2.6a	1.7b	0.6	1.1	0.8	1.2	3.3b	0.6	0.4	-1.8a	0.9	-1.1
Nurse effect
JN3	1.4b	1.4b	0	0.5	1.2	0.8	0	1.4b	0.1	0.2	-0.6	0.5	-0.4

^aP < 0.05.

^bP < 0.01.

^cP < 0.0001.

NS: Not significant.

¹Reference variable includes nurses and others.

²Reference variable is Aps.

³Reference variable is experienced nurses.

⁴Reference variable includes moderate overtime and slight overtime.

⁵Reference variable is unhealthy body weight.

IV: Independent variable; RD: Resident doctor; JN: Junior nurse; HBW: Healthy body weight.