Table 5.

Basic adjusted association between farm residence or farm/animal-related occupation and lymphoplasmacytic lymphoma/Waldenström’s macroglobulinemia risk*

Personal farm-related history	Cases, No.†	Controls, No.†	OR (95% CI)‡	P
Ever lived or worked on a farm
No	143	5424	Ref	.744
Yes	65	3170	0.95 (0.67 to 1.33)
Ever lived on a farm
No	66	3230	Ref	.262
Yes	45	2617	0.79 (0.53 to 1.19)
Ever worked on a farm
No	166	6727	Ref	.651
Yes	27	1210	0.90 (0.58 to 1.40)
Any farming occupation§
No	156	6189	Ref	.563
Yes	27	835	1.14 (0.73 to 1.78)
Animal farming
No	178	6847	Ref	.929
Yes	5	177	0.96 (0.38 to 2.41)
Crop farming
No	174	6757	Ref	.736
Yes	9	267	1.14 (0.55 to 2.37)
Field crop and vegetables
No	131	5520	Ref	.588
Yes	5	115	1.35 (0.48 to 3.78)
Mixed animal and crop
No	163	6036	Ref	.697
Yes	15	455	1.12 (0.64 to 1.96)
General farmer
No	152	5491	Ref	.519
Yes	10	272	1.26 (0.64 to 2.47)
Forestry worker
No	158	5740	Ref	.066||
Yes	4	34	3.17 (1.08 to 9.34)
Meat worker
No	181	6958	Ref	.960
Yes	2	66	1.03 (0.25 to 4.35)

* CI = confidence interval; OR = odds ratio.

† The counts do not add up to the total number of cases/controls due to data missing by design or report.

‡ Adjusted for age, sex, race/ethnicity, and study.

§ Occupation at any time in life (eight studies) or the longest held occupation (two studies); occupations coded according to the International Standard Classification of Occupations (ISCO), Revised Edition 1968 (53).

|| P value using likelihood ratio test; P value using Wald test .036.