Table 2

Characteristics of subjects in the study population* and those subjects included in analyses of multiple pesticides†

Pooled studyIncluded in analyses of multiple pesticides
CharacteristicsCases (n=870)Controls (n=2569)OR (95% CL)‡Cases (n=650)Controls (n=1933)OR (95% CL)
*Pooled study population limited to males and following exclusions.
†Any observation with a missing value for any of the 47 multiple pesticides was not included in analyses.
‡Odds ratios (OR) and 95% confidence limits (CL).
§Odds ratios for the matching factors are not interpretable for their relation with NHL, but are presented for comparison to odds ratios for the subgroup included in analyses of multiple pesticides.
¶GED, General Equivalency Diploma.
Study site
    Iowa/Minnesota520 (60.9%)1039 (40.4%)1.0436 (67.1%)895 (46.3%)1.0
    Kansas153 (17.6%)862 (33.6%)0.3 (0.3 to 0.4)§101 (15.5%)596 (30.8%)0.3 (0.3 to 0.4)
    Nebraska187 (21.5%)668 (26.0%)0.5 (0.4 to 0.7)§113 (17.4%)442 (22.9%)0.5 (0.4 to 0.7)
Respondent status
    Self respondent545 (62.6%)1413 (55.0%)1.0449 (69.1%)1166 (60.3%)1.0
    Proxy respondent325 (37.4%)1156 (45.0%)0.7 (0.6 to 0.9)§201 (30.9%)767 (39.7%)0.7 (0.6 to 0.8)
Age (years)
    <4053 (6.1%)280 (11.0%)0.7 (0.5 to 1.0)§40 (6.2%)211 (10.9%)0.7 (0.5 to 1.1)
    40–59196 (22.6%)493 (19.3%)1.5 (1.1 to 1.9)§160 (24.6%)388 (20.1%)1.6 (1.2 to 2.1)
    60–79478 (55.1%)1261 (49.4%)1.4 (1.1 to 1.7)§355 (54.6%)969 (50.1%)1.4 (1.1 to 1.8)
    ⩾80141 (16.2%)521 (20.4%)1.095 (14.6%)365 (18.9%)1.0
Educational level
    Less than high school graduation387 (45.2%)1126 (44.7%)1.0276 (43.0%)806 (42.4%)1.0
    High school graduation or GED¶226 (26.4%)629 (25.0%)1.0 (0.9 to 1.3)171 (26.6%)467 (24.6%)1.1 (0.9 to 1.3)
    Some college or vocational school151 (17.6%)457 (18.1%)1.0 (0.8 to 1.2)122 (19.0%)368 (19.4%)1.0 (0.8 to 1.2)
    College graduate or more93 (10.9%)308 (12.2%)1.0 (0.7 to 1.1)73 (11.4%)261 (13.7%)0.8 (0.6 to 1.1)
Ever lived or worked on a farm as an adult
    No243 (28.1%)780 (30.4%)1.0243 (37.5%)775 (40.1%)1.0
    Yes621 (71.9%)1780 (69.5%)1.1 (0.9 to 1.3)405 (62.5%)1157 (59.9%)1.1 (0.9 to 1.3)
First degree relative with haematopoietic cancer
    No792 (92.5%)2452 (96.8%)1.0594 (92.8%)1863 (96.7%)1.0
    Yes64 (7.5%)80 (3.2%)2.5 (1.8 to 3.5)46 (7.2%)63 (3.3%)2.3 (1.5 to 3.4)
Histological subtype
    Follicular243 (28.0%)196 (30.1%)
    Diffuse334 (38.5%)233 (35.9%)
    Small lymphocytic99 (11.4%)77 (11.9%)
    Other192 (22.1%)144 (22.2%)