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

Table 2 Main effects on needle stick and sharps injuries in different models for all participants

Main effect		ORs of NSIs for All participants				ORs of NSIs for doctors				ORs of NSIs for nurses
		N	n	M0	M1	N	n	M0	M2	N	n	M0	M2
Body weight level	HBW	471	11	0.5NS	0.5a	53	2	0.3	0.2a	354	7	0.6	0.5
	UHBW	376	18	1.0	1.0	51	6	1.0	1.0	259	9	1.0	1.0
OT work	Heavy	45	6	5.7b	4.3a	17	4	5.4a	2.0	28	2	3.7	3.8
	Moderate	193	7	1.4	1.2	31	1	0.6	0.5	147	5	1.7	1.4
	Mild	609	16	1.0	1.0	56	3	1.0	1.0	438	9	1.0	1.0
Type of medical personnel	Doctors	104	8	2.1	1.3	-	-	-	-	-	-	-	-
	Nurses	613	16	0.7	0.3a	-	-	-	-	-	-	-	-
	Others	130	5	1.0	1.0	-	-	-	-	-	-	-	-
Professional grade (Doctors)	RD	-	-	-	-	33	7	18.9b	17.3a	-	-	-	-
	AP	-	-	-	-	71	1	1.0	1.0	-	-	-	-
Professional grade (Nurses)	Junior	-	-	-	-	-	-	-	-	129	8	3.9b	3.9b
	experiencing	-	-	-	-	-	-	-	-	484	8	1.0	1.0

^aP < 0.05.

^bP < 0.01.

^cP < 0.0001.

NS: Not significant.

Odds ratio = 1.0 indicates the reference; ORs: Odds ratios; N: Participants; n: Participants for needle stick and sharps injuries; M₀: Model only including main effect; M₁: Model adjusted for sex, age, overtime work, and medical specialty; M₂: Model adjusted for sex (only doctors), overtime work, professional grade, and body weight; HBW: Healthy body weight; UHBW: Unhealthy body weight; OT: Overtime; NSIs: Needle stick and sharps injuries.