Table 2.

General characteristics of workers’ return-to-work rate by certification

	Yes		No		Total	P value *
	N	%	N	%
Total	555	93.0	748	86.9	1303	< 0.0001
Age						< 0.0001
< 30	35	83.3	38	95.0	73
30–39	113	94.2	85	96.6	198
40–49	184	96.8	163	94.2	347
50–59	173	92.0	297	88.4	470
≥ 60	50	87.7	165	73.7	215
Sex						< 0.0001
Male	501	93.1	592	89.0	1093
Female	54	91.5	156	79.6	210
Marital status						< 0.0001
Not married	96	88.9	89	82.8	185
Married	414	95.0	532	90.7	946
Other	45	84.9	127	95.1	172
Education level						< 0.0001
Less than high school	122	89.1	379	82.8	501
High school	299	94.6	291	90.7	590
College or above	134	93.1	78	95.1	212
Industry						0.0101
Manufacturing	212	95.1	298	89.8	510
Construction	139	91.5	194	82.9	333
Service	91	94.8	77	86.5	168
Other	113	89.7	179	86.9	292
Status of workers						0.0019
Regular worker	351	95.1	409	92.3	760
Daily worker	204	89.5	339	81.1	543
Occupational injury type						0.2083
Injury	501	93.3	690	86.6	1191
Disease	54	90.0	58	90.6	112
Number of employees						0.0043
< 5	106	93.0	184	83.3	290
5–9	118	93.7	193	88.5	311
10–29	169	93.4	185	86.9	354
≥ 30	162	92.1	186	89.0	348
Duration of employment						0.0038
< 1 year	324	92.1	488	84.4	812
1–less than 3 years	70	89.7	103	92.0	173
≥ 3 years	161	96.4	157	91.8	318
Disability rating						0.0662
1–7	10	52.6	30	71.4	40
8–14	445	94.5	579	86.8	1024
None	100	93.5	139	91.5	239

*Analyses using a chi-square test