Table 4 Hazard ratio for the seasonal risk term for various peak risk months.

From: Hodgkin Lymphoma has a seasonal pattern of incidence and mortality that depends on latitude

Peak risk month

Hazard Ratio

Lower 95% CI

Upper 95% CI

p

January

1.023

0.973

1.075

0.380

February

0.992

0.944

1.042

0.748

March

0.965

0.919

1.014

0.155

April

0.947

0.902

0.995

0.032

May

0.943

0.897

0.991

0.021

June

0.954

0.908

1.003

0.065

July

0.978

0.931

1.028

0.380

August

1.008

0.956

1.060

0.748

September

1.036

0.987

1.089

0.155

October

1.056

1.005

1.109

0.032

November

1.060

1.009

1.114

0.021

December

1.048

0.997

1.102

0.065

  1. The Cox proportional-hazards model included only cases diagnosed north of 38.05°N. The hazard ratios for different peak risk months are shown. A detailed explanation of the calculation of the seasonal risk term is given in the methods section. 95% confidence intervals of the hazard ratios are given.
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