Noise exposure in occupational setting associated with elevated blood pressure in China

BMC Public Health

Table 2 Levels of SBP and DBP in the subjects of noise exposed and non-exposed groups

Groups	n	SBP		DBP
Groups	n	Mean ± SD	P value*	Mean ± SD	P value*
Non-exposed group	1399	117.2 ± 15.7		70.0 ± 10.5
Exposed group	1390	125.1 ± 13.9	<0.001	77.6 ± 10.7	<0.001
Noise intensity (dB)
80-	490	124.2 ± 14.7^#		75.8 ± 11.1^#
85-	571	124.9 ± 12.8^#		78.1 ± 10.1^#,$
90-	237	126.2 ± 14.6^#	<0.001	78.8 ± 11.1^#,$	<0.001
≥ 95	92	129.1 ± 13.8^#,$,§		80.7 ± 9.5^#,$
Work-years of noise exposure
1-	795	123.9 ± 13.4^#		76.0 ± 10.3^#
5-	394	125.7 ± 13.8^#,$		78.8 ± 10.3^#,$
10-	100	126.8 ± 13.8^#,$	<0.001	81.5 ± 11.5^#,$,§	<0.001
≥ 15	101	130.7 ± 16.5^#,$,§		81.3 ± 11.1^#,$,§,§
cumulative noise exposure
80-	479	123.3 ± 12.9^#		75.2 ± 10.1^#
90-	434	124.8 ± 13.9^#		77.5 ± 10.5^#,$
95-	274	126.0 ± 15.1^#,$	<0.001	79.3 ± 11.5^#,$,§	<0.001
≥ 100	203	128.8 ± 13.9^#,$,§,&		81.0 ± 9.8^#,$,§
Noise category
Stable	451	124.7 ± 12.5		77.6 ± 9.2
Unstable	939	125.4 ± 14.5	0.369	77.6 ± 11.3	0.958
Noise protection
Yes	956	124.4 ± 12.0		77.3 ± 9.3
No	185	124.6 ± 13.7	0.855	77.3 ± 10.8	0.983

*P values were calculated by one-way ANOVA, and then followed by SNK for multiple comparison. #significant difference with non-exposed group. $, significant difference with the group of 80- for Noise intensity, 1- for Work-years of noise exposure, and 80- for cumulative noise exposure. §, significant difference with the group of 85- for Noise intensity, 5- for Work-years of noise exposure, and 90- for cumulative noise exposure. &, significant difference with the group of 90- for Noise intensity, 10- for Work-years of noise exposure, and 95- for cumulative noise exposure

ISSN: 1471-2458