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

Table 1 Characteristics of study participants according to their medical specialty and professional grade

Variable	Totaln	NSIs			Female			Age		HBW			Moderate OT			Heavy OT
		n	%	P1	n	%	P1	mean ± SD	P2	n3	%	P1	n	%	P	n	%	P1
Profession groups
Doctors	104	8	7.7	a	28	26.9	c	40.9 ± 10.4	c	53	51.0	NS	31	29.8	b	17	16.3	c
Nurses	613	16	2.6		588	95.9		33.6 ± 8.3		354	57.8		147	24.0		28	4.6
Others	130	5	3.9		95	73.1		40.6 ± 7.1		64	49.2		15	11.5		0	0.0
Profession grade (doctor)
AP	71	1	1.4	b	14	19.7	a	45.5 ± 9.3	c	33	46.5	NS	22	31.0	b	6	8.5	b
RD	33	7	21.2		14	42.4		31.0 ± 2.9		20	60.6		9	27.3		11	33.3
Profession grade (nurse)
N	129	8	6.2	3	119	92.2	NS	25.3 ± 3.3	c	78	60.5	NS	42	32.6	a	6	4.7	NS
N1	134	1	0.8		128	95.5		29.0 ± 4.9b		70	52.2		35	26.1		3	2.2
N2	145	3	2.1		140	96.6		34.6 ± 6.7		84	57.9		24	16.6		9	6.2
N3	143	4	2.8		140	97.9		40.5 ± 6.5		86	60.1		29	20.3		6	4.2
N4	62	0	0		61	98.4		42.3 ± 4.8		36	58.1		17	27.4		4	6.5

^aP < 0.05.

^bP < 0.01.

^cP < 0.0001.

NS: Not significant.

¹Chi-square test or Fisher’s exact test.

²Moderate overtime work is 45–80 h/mo, and heavy overtime work is > 80 h/mo.

³Overweight/Obesity.

OT: Overtime; NSIs: Needle stick and sharps injuries.