Table 5.

Logistic regression models for invasive pneumococcal disease (IPD) risk and IPD with pneumonia in relation to occupation and to occupational exposure defined by job–exposure matrix restricted to cases and controls 50–65 years of age

Occupational exposures	IPD
	All IPD (n=2679)			IPD with pneumonia (n=1855)
	N	OR	95%	N	OR	95%
Welder*	27	3.79	2.27 to 6.32	24	3.87	2.23 to 6.72
Foundry worker	2	NA	NA	1	NA	NA
Steel mill worker*	12	0.92	0.83 to 1.02	9	1.47	0.66 to 3.24
Blacksmith*	11	1.93	1.44 to 2.57	8	2.94	1.25 to 6.99
All metalworkers*	52	2.34	1.64 to 3.32	42	2.77	1.87 to 4.10
Fumes†
All	491	1.04	0.89 to 1.21	352	1.08	0.91 to 1.30
Low	459	0.98	0.84 to 1.14	323	1.00	0.84 to 1.21
High	32	3.13	1.95 to 5.04	29	3.29	1.98 to 5.47
Inorganic dust†
All	621	1.14	0.97 to 1.33	443	1.16	0.96 to 1.40
Low	601	1.12	0.96 to 1.31	428	1.14	0.95 to 1.38
High	20	1.77	0.99 to 3.15	15	1.83	0.95 to 3.52
Silica dust†
All	123	1.41	1.11 to 1.78	84	1.46	1.10 to 1.94
Low	112	1.37	1.07 to 1.73	75	1.43	1.05 to 1.93
High	11	1.81	0.86 to 3.81	9	1.79	0.78 to 4.11
Vapours and gases†
All	579	0.96	0.82 to 1.12	419	1.02	0.85 to 1.22
Low	535	0.91	0.78 to 1.06	383	0.95	0.79 to 1.15
High	44	2.38	1.58 to 3.57	36	2.65	1.67 to 4.18
Organic dust†	224	0.93	0.79 to 1.10	156	0.93	0.76 to 1.14
All	215	0.93	0.78 to 1.10	150	0.92	0.74 to 1.13
Low	9	1.21	0.50 to 2.94	6	1.57	0.55 to 4.48
High
Any exposure‡	1061	1.13	1.02 to 1.24	752	1.12	1.00 to 1.27

*Matched for gender, age and place of residency and adjusted for educational level, chronic obstructive pulmonary disease (COPD), asthma, diabetes and ethanol abuse.

†Matched for gender, age and place of residency, and adjusted for educational level, ethanol abuse, and diagnoses of COPD, asthma and diabetes and other occupational exposures.

‡Matched for gender, age and place of residency, and adjusted for educational level, ethanol abuse, and diagnosis of COPD, asthma and diabetes.

NA, not applicable.