Breast cancer patient delay in Fukushima, Japan following the 2011 triple disaster: a long-term retrospective study

Table 3 Proportions and crude and age-adjusted risk ratios of patient delay post- versus pre-disaster (95% CI)

Characteristics	Proportion (%)	Crude risk ratio	Age-adjusted risk ratio
Total delay (≥3 months)
Pre-disaster	18.0% (22/122)	Ref.	Ref.
Post-disaster
Overall population	29.9% (29/97)	1.66 (1.02–2.69)*	1.66 (1.02–2.70)*
2011–2012^a	20.0% (2/10)	1.11 (0.30–4.05)	1.11 (0.30–4.04)
2012–2013^a	27.3% (6/22)	1.51 (0.69–3.30)	1.51 (0.69–3.30)
2013–2014^a	26.7% (4/15)	1.48 (0.59–3.71)	1.49 (0.59–3.74)
2014–2015^a	37.0% (10/27)	2.05 (1.10–3.82)*	2.05 (1.10–3.81)*
2015–2016^a	30.4% (7/23)	1.69 (0.82–3.48)	1.75 (0.84–3.63)
Excessive delay (≥12 months)
Pre-disaster	4.1% (5/122)	Ref.	Ref.
Post-disaster
Overall population	18.6% (18/97)	4.53 (1.74–11.76)**	4.49 (1.73–11.65)**
2011–2012^a	10.0% (1/10)	2.44 (0.31–18.91)	2.44 (0.31–18.85)
2012–2013^a	22.7% (5/22)	5.55 (1.75–17.57)**	5.58 (1.77–17.56)**
2013–2014^a	6.7% (1/15)	1.63 (0.20–13.01)	1.63 (0.20–12.94)
2014–2015^a	22.2% (6/27)	5.42 (1.78–16.47)**	5.27 (1.73–16.03)**
2015–2016^a	21.7% (5/23)	5.30 (1.67–16.87)**	5.24 (1.64–16.78)**

ISSN: 1471-2407