Table 3.

Relationship between subject characteristics and occupational injuries by injury risk levels

Variables	Occupational injuries (Low-risk group)				Occupational injuries (High-risk group)
	Total	Yes		p-valuec	Total	Yes		p-valuec
	Na	Na	%b		Na	Na	%b
General characteristics
Age (years)
15–29	2746	6	0.2	< 0.001	708	11	1.7	0.012
30–39	4811	16	0.3	< 0.001d	1340	45	3.2	0.986d
40–49	5284	19	0.3		1808	72	4.3
50–59	3349	21	0.5		1571	44	2.5
≥ 60	1987	20	0.8		923	22	2.7
Sex
Male	8640	38	0.4	0.829	3999	127	3.3	0.466
Female	9537	44	0.4		2351	67	2.7
Education level
Middle school or below	1887	24	1.1	< 0.001	1109	31	2.7	0.130
High school	6266	31	0.4	< 0.001d	3189	111	3.6	0.393d
College or above	10,024	27	0.2		2052	52	2.5
Monthly income (KRW 10,000)
< 150	5501	37	0.5	0.018	1934	39	1.9	0.006
150–249	6198	19	0.3	0.053d	2312	89	3.9	0.056d
250–399	4773	17	0.3		1694	55	3.4
≥ 400	1705	9	0.3		410	11	2.7
Occupational characteristics
Occupational type
White-collar	8943	25	0.2	< 0.001	1285	28	2.3	0.119
Pink-collar	4865	20	0.3		1576	50	3.5
Blue-collar	4369	37	0.7		3489	116	3.3
Number of employees
1–4	4047	22	0.4	0.599	1448	47	3.1	0.943
5–49	9302	43	0.4	0.216d	3212	98	3.3	0.481d
50–299	3317	12	0.3		1142	34	3.0
≥ 300	1511	5	0.2		548	15	2.5
Working hours per a week (hours)
< 40	10,350	44	0.3	0.042	2951	54	1.8	< 0.001
41–52	4955	18	0.3	0.021d	1841	70	3.7	< 0.001d
53–60	2011	11	0.5		1076	53	5.3
≥ 61	861	9	1.0		482	17	3.5
Tenure (years)
< 1	2203	5	0.2	0.168	815	12	1.6	0.019
1–5	6713	36	0.4	0.714d	2133	69	3.2	0.012d
≥ 5	9261	41	0.4		3402	113	3.4
Shift work
Yes	1643	10	0.5	0.318	908	20	2.2	0.107
No	16,534	72	0.4		5442	174	3.3
Type of employment
Regular	13,841	48	0.3	< 0.001	4347	132	3.2	0.899
Temporary	4336	34	0.7		2003	62	3.0
Labor unions
Presence	2506	8	0.2	0.289	935	19	1.9	0.049
Absence	15,671	74	0.4		5415	175	3.3
Job-related factors
Physical risk factors
Yes	5243	55	0.9	< 0.001	4224	161	3.8	< 0.001
No	12,934	27	0.2		2126	33	1.8
Biochemical risk factors
Yes	3017	42	1.2	< 0.001	3080	128	4.0	< 0.001
No	15,160	40	0.2		3270	66	2.2
Ergonomic risk factors
Yes	14,438	78	0.5	< 0.001	6057	188	3.1	0.305
No	3739	4	0.1		293	6	2.8
Usage of personal protective equipment
No need	15,468	54	0.3	< 0.001	3042	66	1.9	< 0.001
Need/wear	2440	24	0.9		3038	118	4.2
Need/no wear	269	4	1.6		270	10	4.5
Provision of safety and health information
Yes	11,227	47	0.4	0.406	4396	119	2.8	0.016
No	6950	35	0.4		1954	75	3.8

^aUnweighted case numbers of workers

^bPercentages based on weighted analysis

^cP-value of the weighted chi-squared test results

^dP-value for trend in the weighted analysis