Table 2.

Summary of fibre levels by plant and job group, exposure intensity in samples collected with 0.5–3.5 h sampling time

Job group	Fibres (fibres per cm3)
	Plant A							Plant B							Plant C
	Unadjusted					Adjusteda		Unadjusted					Adjusteda		Unadjusted					Adjusteda
	Nb	Kc	AM	GM	GSDd	GM	P95e	Nb	Kc	AM	GM	GSDd	GM	P95e	Nb	Kc	AM	GM	GSDd	GM	P95e
Furnace
Mix	14	3	0.11	0.097	1.8	0.096	0.25								10	5	0.072	0.046	3.0	0.047	0.22
Charger															10	4	0.43	0.36	2.0	0.36	0.82
Charger/mix															11	5	0.39	0.31	2.2	0.31	0.88
Payloader	10	2	0.12	0.086	2.5	0.086	0.37	5	1	0.037	0.025	2.9	0.025	0.098	18	6	0.58	0.24	4.3	0.24	2.4
Crane	21	8	0.18	0.082	2.9	0.081	0.25	19	7	0.056	0.036	3.0	0.037	0.16	14	7	0.082	0.039	4.3	0.037	0.28
Control room	21	5	0.87	0.46	3.8	0.46	2.2	20	5	0.11	0.062	2.5	0.061	0.61	19	8	0.12	0.080	2.8	0.078	0.48
Cleaning	2	1	2.8	2.7	1.6	2.7	3.7
Sorting	19	5	0.21	0.13	2.8	0.13	0.66	21	4	0.32	0.19	2.7	0.18	1.1	21	9	0.50	0.43	1.9	0.43	0.97
Processing
Refinery
Crusher	29	14	0.029	0.022	2.4	0.022	0.073	15	2	0.058	0.037	2.5	0.040	0.21	19	6	0.032	0.021	2.7	0.019	0.097
Other	29	13	0.050	0.030	2.4	0.031	0.12	27	13	0.019	0.015	2.3	0.015	0.044	32	8	0.019	0.013	2.7	0.013	0.048
Fines	36	21	0.015	0.011	2.2	0.011	0.044	60	23	0.010	0.007	2.3	0.007	0.034	49	19	0.014	0.011	2.2	0.011	0.035
Maintenance
Mechanics	48	18	0.057	0.034	2.9	0.035	0.16	47	16	0.050	0.017	4.0	0.017	0.24	27	9	0.092	0.049	3.0	0.051	0.42
Electrician	21	7	0.15	0.086	2.6	0.085	0.39	22	7	0.096	0.041	3.0	0.043	0.23	10	5	0.025	0.017	2.6	0.018	0.059

The Norwegian OEL for SiC fibre is 0.1 fibre per cm³ (The Norwegian Labour Inspection Authority, 2007).

^aAdjusted with mixed effect models.

^bNumber of measurements.

^cNumber of persons.

^dGeometric standard deviation.

^e95th percentile.