Effects of cleaning spray use on eyes, airways, and ergonomic load

BMC Public Health

Table 8 Physical workload during bathroom cleaning for the eleven cleaning workers during spray and water exposure

	percentile	Water	Spray	p-value
	percentile	Mean (SD)	Mean (SD)	p-value
Postures (°)
Head
Inclination	10^th	-22 (7)	-19 (6)	0.01*
	50^th	23 (19)	21 (10)	0.03*
	90^th	59 (15)	56 (13)	0.09
Back
Inclination	50^th	18 (8)	17 (7)	0.06
Upper arm, right
Elevation	50^th	37 (9)	35 (7)	0.07
Elevation	90^th	85 (18)	79 (17)	0.03*
Wrist, right
Flexion	10^th	-55 (9)	-52 (6)	0.03*
	50^th	-21 (8)	-22 (8)	0.25
	90^th	8 (12)	7 (11)	0.08
Velocity (°/s)
Upper arm, right	50^th	85 (36)	82 (32)	0.25
Wrist, right	50^th	32 (10)	33 (9)	0.72
Muscular load
Shoulder, right
Recovery (% time)		4 (5)	3 (2)	0.39
Activity (%MVE)	90^th	27 (11)	28 (11)	0.86
Forearm, right
Recovery (% time)		3 (4)	1 (2)	0.08
Activity (%MVE)	90^th	32 (7)	37 (9)	0.01*

Values are mean and standard deviation (SD) of postures and movements of the head, back, and right upper arm and wrist as well as the muscular load in the shoulder and forearm muscles. Differences between spray and water were calculated using Wilcoxon signed rank tests. Statistical significance at a level of p < 0.05 is indicated with a star (*)

ISSN: 1471-2458