Table 2

Relationships of age and length of service according to occupational injury type (446 120 person-years, 15 195 injuries): risk ratio adjusted for job and 95% CI

	Fall on same level		Fall to lower level		Handling materials/machine parts during assembly		Handling objects		Lifting/handling equipment
	(n=3739)		(n=2536)		(n=3400)		(n=1192)		(n=476)
Age (years)
<25	0.86	0.51–1.44	0.68	0.39–1.17	1.19	0.63–2.24	0.62	0.22–1.72	0.73	0.24–2.28
25–29	0.88	0.55–1.41	0.62	0.38–1.02	0.87	0.48–1.58	0.59	0.24–1.46	0.63	0.23–1.74
30–34	0.90	0.58–1.39	0.68	0.43–1.06	0.89	0.52–1.55	0.61	0.26–1.40	0.53	0.21–1.31
35–39	0.88	0.60–1.29	0.72	0.49–1.05	0.94	0.57–1.55	0.77	0.37–1.59	0.64	0.31–1.36
40–44	0.88	0.62–1.23	0.88	0.63–1.24	0.88	0.56–1.38	0.69	0.36–1.32	0.74	0.39–1.43
45–49	0.95	0.70–1.29	1.02	0.75–1.38	0.86	0.57–1.31	0.77	0.42–1.40	0.70	0.38–1.28
50–55	1.00		1.00		1.00		1.00		1.00
Length of service (years)
<1	1.59	0.89–2.83	1.84	1.00–3.36	2.27	1.09–4.72	2.12	0.67–6.68	3.55	0.98–12.9
1	2.48	1.42–4.34	3.31	1.86–5.90	3.08	1.51–6.32	2.66	0.87–8.18	4.06	1.14–14.4
2	2.58	1.48–4.50	3.04	1.70–5.42	3.12	1.52–6.39	2.78	0.91–8.49	2.55	0.68–9.54
3–4	2.04	1.17–3.56	2.68	1.51–4.73	2.62	1.29–5.33	1.76	0.57–5.44	5.15	1.53–17.3
5–9	1.79	1.09–2.95	2.29	1.39–3.79	2.16	1.13–4.16	2.58	0.97–6.85	2.86	0.96–8.51
10–14	1.46	0.90–2.39	1.77	1.08–2.91	1.94	1.03–3.66	2.39	0.93–6.09	3.60	1.26–10.3
15–19	1.44	0.96–2.17	1.67	1.12–2.51	1.91	1.11–3.28	1.70	0.76–3.83	2.81	1.16–6.79
20–24	1.36	0.93–1.98	1.42	0.98–2.06	1.67	1.00–2.81	1.80	0.85–3.82	2.74	1.23–6.12
25–29	1.25	0.86–1.83	1.25	0.86–1.81	1.58	0.94–2.66	1.46	0.68–3.13	2.75	1.25–6.06
≥30	1.00	1.00	1.00	1.00	1.00		1.00		1.00

	Operating machines/equipment		Collision with/by moving objects		Collision with/by vehicles		Using hand tools		Others
	(n=421)		(n=550)		(n=691)		(n=863)		(n=1327)

Age (years)
<25	0.87	0.21–3.63	1.01	0.35–2.92	0.93	0.36–2.39	1.90	0.50–7.23	1.11	0.54–2.26
25–29	1.08	0.29–4.10	0.48	0.18–1.31	0.81	0.35–1.88	1.18	0.34–4.12	0.91	0.47–1.76
30–34	1.03	0.31–3.46	0.56	0.23–1.37	0.70	0.34–1.46	0.97	0.31–3.05	0.82	0.45–1.49
35–39	0.73	0.26–2.06	0.68	0.32–1.44	0.78	0.42–1.48	0.95	0.34–2.69	0.78	0.47–1.32
40–44	1.15	0.45–2.93	0.78	0.40–1.52	1.00	0.58–1.73	1.11	0.42–2.95	0.75	0.47–1.17
45–49	1.11	0.47–2.63	1.01	0.55–1.85	0.89	0.55–1.45	1.13	0.46–2.77	1.01	0.67–1.51
50–55	1.00		1.00		1.00		1.00		1.00
Length of service (years)
<1	2.18	0.45–10.6	3.26	0.95–11.2	1.70	0.60–4.76	1.32	0.27–6.41	2.12	0.96–4.70
1	1.27	0.25–6.36	4.03	1.22–13.4	1.78	0.64–4.90	2.28	0.50–10.5	2.54	1.16–5.54
2	2.33	0.50–11.0	5.43	1.67–17.6	2.50	0.92–6.76	2.07	0.45–9.42	3.19	1.48–6.88
3–4	1.79	0.38–8.38	5.72	1.80–18.2	2.19	0.82–5.83	1.96	0.43–8.88	2.59	1.20–5.58
5–9	1.82	0.46–7.23	3.72	1.32–10.5	1.86	0.80–4.33	2.08	0.53–8.09	2.25	1.14–4.44
10–14	1.20	0.30–4.74	3.54	1.31–9.58	2.03	0.90–4.62	2.47	0.67–9.19	2.18	1.12–4.25
15–19	1.71	0.57–5.18	2.52	1.10–5.76	1.63	0.82–3.22	1.71	0.53–5.52	1.93	1.11–3.34
20–24	1.31	0.46–3.74	2.30	1.06–4.98	1.38	0.74–2.57	1.64	0.53–5.04	1.59	0.96–2.66
25–29	1.31	0.45–3.76	1.79	0.84–3.82	1.75	0.98–3.14	1.13	0.37–3.50	1.48	0.91–2.43
≥30	1.00		1.00		1.00		1.00		1.00

n indicate number of occupational injuries.