Table 1.

Associations of sexual behavior and self-reported history of sexually transmitted infections with non-Hodgkin lymphoma

Cases (n = 694)Controls (n = 694)Adjusted OR* (95% CI)PPtrend
Sexual behavior since age 15 y
    Exclusively heterosexual6496581.00
    Primarily heterosexual, some homosexual experience981.13 (0.43-2.97)
    About equal heterosexual and homosexual experience522.34 (0.45-12.26)
    Primarily homosexual, some heterosexual experience331.05 (0.21-5.27)
    Exclusively homosexual732.52 (0.65-9.80)0.530.14
    Never engaged in sexual activities1681.92 (0.81-4.57)
    Refused5120.34 (0.12-1.00)0.13
Lifetime number of sexual partners
    12652731.00
    2-41841811.09 (0.83-1.42)
    5-9100911.18 (0.83-1.66)
    10-1961690.96 (0.64-1.43)
    20-4936331.15 (0.69-1.93)
    50-996120.52 (0.19-1.42)
    100+842.02 (0.59-6.88)0.570.76
    None1682.02 (0.84-4.85)
    Refused18230.73 (0.38-1.40)0.40
Gonorrhea
    Never6826851.00
    Ever1291.35 (0.56-3.24)0.50
Genital herpes
    Never6826791.00
    Ever12150.82 (0.38-1.77)0.62
Genital warts
    Never6826771.00
    Ever12170.74 (0.35-1.57)0.43
Anal warts
    Never6896911.00
    Ever531.71 (0.41-7.23)0.46
Chlamydia
    Never6876911.00
    Ever732.42 (0.62-9.47)0.18
One or more of above sexually transmitted infections
    Never6546511.00
    Ever40430.95 (0.61-1.49)0.83
  • * Adjusted for the matching variables (age, sex, and geographic area) and ethnicity.

  • P, excluding subjects who refused to answer or never engaged in sexual activities.

  • P, including all subjects.