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Table 2 The results of comparing the frequency of underlying diseases between the study groups

From: Does endometriosis increase susceptibility to COVID-19 infections? A case–control study in women of reproductive age

  Case group (N = 507) Control group (N = 520) p-value
Frequency Percent Frequency Percent
None 408 80.5 376 72.3 0.002a
Thyroid disease 5 0.98 3 0.57 0.501b
Diabetes mellitus 11 2.2 23 4.6 0.038a
Cardiovascular disease 2 0.4 36 7.2  < 0.001a
Hypertension 13 2.6 42 8.4  < 0.001a
Asthma 1 0.2 6 1.2 0.124b
Allergy 13 2.6 23 4.6 0.057a
Cancer 5 1.0 11 2.2 0.097a
Sinusitis 6 1.2 2 0.4 0.173b
Lupus erythematosus 2 0.4 6 1.2 0.156b
Rheumatoid arthritis 4 0.8 26 5.2  < 0.001b
Other 18 3.6 24 4.8 0.314a
  1. Results of: aChi-square test, bFisher’s exact test