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Table 3 Characteristics of the studies included in the dose-analysis meta-analysis

From: Prognosis of pregnancy-associated breast cancer: a meta-analysis

Study ID Time point of breast cancer diagnosis Time after last delivery
(months)
No. of participants Adjusted HRa 95% CI
Guinee, 1994 [30] Postpartum 1–12 m 1–12 40 1.88 0.88–3.98
Postpartum 13–48 m 13–48 51 1.09 0.54–2.19
Postpartum ≥49 m ≥49 35 0.54 0.19–1.55
Olson, 1998 [35] Postpartum < 24 m 0–24 42 3.1 1.8–5.4
Postpartum ≥24 m ≥24 352 1.3 0.9–2.0
Reeves, 2000 [36] Postpartum < 60 m 0–60 67 1.56 1.01–2.42
Postpartum 60–108 m 60–108 80 0.88 0.58–1.32
Postpartum > 120 m > 120 525 0.99 0.77–1.27
Daling, 2002 [38] Postpartum < 24 m 0–24 83 2.3 1.5–3.4
Postpartum 24–60 m 24–70 120 1.5 1.0–2.1
Postpartum > 60 m > 70 661 1.2 0.9–1.6
Whiteman, 2004 [42] Postpartum ≤12 m 0–12 59 1.51 1.02–2.23
Postpartum 13–48 m 13–48 213 1.25 0.95–1.64
Postpartum > 48 m > 48 1470 1.06 0.86–1.31
Phillips, 2009 [48] Postpartum < 24 m 0–24 133 2.75 1.98–3.83
Postpartum 24–60 m 24–60 231 2.2 1.65–2.94
Postpartum ≥72 m ≥72 2067 0.98 0.79–1.22
Calliha, 2013 [58] Postpartum < 60 m 0–60 86 2.65 1.09–6.42
Postpartum ≥60 m ≥60 172 1.52 0.71–3.28
Nagatsuma, 2014 [63] Postpartum ≤24 m 0–24 37 2.19 1.05–4.56
Postpartum 36–60 m 36–60 59 1.49 0.79–2.83
Postpartum > 60 m > 60 181 0.81 0.46–1.43
Johansson, 2018 [2] Postpartum 0–6 m 0–6 41 1.16 0.64–2.14
Postpartum 6–12 m 6–12 84 1.3 0.83–2.03
Postpartum 12–24 m 12–24 194 1.01 0.70–1.46
Postpartum 24–60 m 24–60 629 1.22 0.96–1.55
Postpartum 60–120 m 60–120 1106 1.08 0.87–1.53
Postpartum > 120 m > 120 1623 0.98 0.78–1.22
Chuang, 2018 [69] Postpartum 0–12 m 0–12 347 1.29 0.96–1.74
Postpartum 13–24 m 13–24 410 1.27 0.95–1.70
Postpartum 25–60 m 25–60 1583 1.06 0.88–1.27
  1. aCorresponding reference category: nulliparous