Table 2 Incidence rates (IRs, per 1000 person-months) and incidence rate ratios (IRRs) of psychiatric disorders and cardiovascular diseases during the 6 weeks before diagnosis of women that underwent a breast diagnostic workup, a population-based cohort study during 2005–2014 in Skåne, Sweden

 Reference group*

1.0

 Unspecified lump in breast

1.1 (1.0–1.2)

 Benign tumor

1.3 (1.1–1.5)

 Breast cancer

1.4 (1.2–1.6)

  T0N0M0/stage 0/stage I

1.4 (1.1–1.6)

  Stage II

1.4 (1.1–1.7)

  Stages III and IV

1.8 (1.2–2.6)

  Missing stage

1.0 (0.4–2.5)

 Reference group*

1.0

 Unspecified lump in breast

1.1 (1.0–1.2)

 Benign tumor

1.3 (1.1–1.6)

 Breast cancer

1.9 (1.8–2.0)

  T0N0M0/stage 0/stage I

1.7 (1.5–1.9)

  Stage II

1.8 (1.6–2.1)

  Stages III and IV

2.8 (2.4–3.3)

  Missing stage

2.9 (2.1–3.9)