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Table 2 Age- and sex-adjusted relative risks for leukemia among subjects with allergic conditions.

From: Allergic conditions and risk of hematological malignancies in adults: a cohort study

  Leukemia Leukemia, excluding CLL
Exposure N e N o RR 95% CI N e N o RR 95% CI N e N o RR 95% CI
Asthma, hay fever or hives 31 94 1.4 (0.9–2.1) 21 43 2.0 (1.2–3.4) 10 51 0.8 (0.4–1.6)
Hay fever 21 105 1.1 (0.7–1.8) 14 50 1.5 (0.8–2.8) 7 55 0.7 (0.3–1.6)
Asthma 7 126 1.6 (0.8–3.5) 3 64 1.3 (0.4–4.2) 4 62 1.9 (0.7–5.3)
Hives 7 120 2.1 (1.0–4.5) 6 58 3.6 (1.6–8.5) 1 62 0.6 (0.1–4.3)
Eczema* 8 115 0.9 (0.5–1.9) 3 59 0.7 (0.2–2.2) 5 56 1.2 (0.5–3.1)
Allergic conditions** 30 87 1.1 (0.8–1.7) 18 42 1.4 (0.8–2.4) 12 45 0.9 (0.5–1.7)
  1. Ne = No. of exposed cases, No = No. of unexposed cases.
  2. * At least one positive answer for eczema during childhood or allergic eczema.
  3. ** At least one positive answer for asthma, hay fever, eczema during childhood or allergic eczema.