Table 2. Distribution of noise exposure levels among the manufacturing industry in different enterprise-scale and ownership type — China, 2020.

Item	Total number of enterprises	Total number of workers	Environmental noise exposure level [dB(A)]			Individual noise exposure level LEx,8h/LEx,40h* [dB(A)]		The proportion of individual noise exposure level ≥85 dB(A) (%)
			Number of samples	Median (IQR)		Number of samples	Median (IQR)
* LEx,8h: Normalization of equivalent continuous A-weighted sound pressure level to a nominal 8 hours working day. LEx,40h: Normalization of equivalent continuous A-weighted sound pressure level to a nominal 40 hours working week.
Enterprise-scale
Large	458	76,923	6,291	83.3 (80.1–87.2)		4,884	81.1 (76.6–84.5)	22.07
Medium	1,878	169,139	20,556	83.1 (79.7–87.2)		17,277	80.9 (76.1–84.6)	23.13
Small	9,926	236,325	59,901	82.5 (79.1–86.5)		52,774	81.2 (76.9–84.8)	24.00
Mini-sized	7,116	51,331	25,110	83.2 (79.3–88.1)		22,484	81.7 (77.4–86.2)	30.11
P-value				<0.001			<0.001
Ownership type
State-owned	683	42,526	6,405	83.4 (80.1–87.6)		4,677	80.6 (76.9–84.1)	19.53
Collective	120	1,784	461	83.0 (79.8–86.2)		434	81.6 (78.1–84.3)	20.97
Joint-equity cooperative enterprises	221	9,246	1,425	83.0 (79.2–87.2)		1,196	81.6 (77.3–85.1)	25.42
Joint-operate	31	2,285	205	81.0 (78.4–84.7)		187	80.0 (76.0–84.1)	17.65
Private	6,421	114,065	29,957	83.0 (79.3–87.5)		25,687	81.4 (77.2–85.6)	27.91
Incorporated company	527	33,265	3,995	82.2 (78.5–86.0)		3,335	81.0 (76.8–84.3)	21.71
Limited liability company	10,062	275,998	60,573	82.8 (79.3–86.7)		54,075	81.3 (76.7–84.9)	24.70
Hong Kong, Macau, and Taiwan-invested enterprises	364	19,447	2,931	82.3 (79.1–86.2)		2,709	81.0 (75.9–84.3)	22.55
Foreign	476	26,638	3,625	82.3 (78.9–85.8)		3,167	81.1 (76.9–84.5)	22.99
Others	473	8,464	2,281	83.1 (79.3–87.6)		1,952	81.7 (77.1–85.8)	28.54
P-value				<0.001			<0.001
Total	19,378	533,718	111,858	82.8 (79.3–87.0)		97,419	81.3 (76.9–85.0)	25.14