Factors related to breast cancer detection mode and time to diagnosis in Alberta, Canada: a population-based retrospective cohort study

Table 2 Median and 90^th percentile in days of the diagnostic interval by detection mode

Factor	Screen-detected (n = 4747)			Symptom-detected (n = 7280)
Factor	Median	90 %	P-value	Median	90 %	P-value
Overall	19	70		21	92
Demographic factors
Age
39-	NA	NA	0.10	21	80	<0.001
40–49	21	91		21	98
50–69	19	69		21	100
70–74	19	66		23	106
75+	18	60		20	70
Neighborhood Income Quintile
> 80 %	17	77	0.046	21	102	0.49
60 % ~ 80 %	20	70		21	93
40–60 %	19	66		21	98
20 % ~ 40 %	19	70		22	88
< 20 %	22	68		21	83
Missing	37	130		26.5	75
CLINICAL FACTORS
Stage
In Situ	30	87	<0.001	49	156	<0.001
I	15	57.5		25	106
II	16	71		19	66
III	15	123.5		17	71
IV	16	83		13	65
Missing	38	133.5		19.5	97
Histological Grade
Well differentiated	17	62	0.008	28	112	<0.001
Moderately differentiated	18	68		21	93
Poorly or undifferentiated	20	73		19	74
Unknown/ Not stated/ Not applicable	34	100		35	135.5
Charlson Comorbidity Index
0	19	70	0.067	21	98	0.004
1	21	75		20	81
≥ 2	19	63		20	86
Healthcare factors
Regional Health Authority
1	29.5	83.5	<0.001	26	106	<0.001
2	41.5	110		33	128
3	25	73		25	98
4	29	70		22	84
5	19	62		19	100
6	7	54		17	87
7	19	69		16	69
8	29.5	181		13	86
9	29.5	57.5		14	58
Time Period
2004–2006	18	67	0.024	21	87	0.72
2007–2010	20	73	0.024	21	97	0.72
Usual Provider Continuity
High continuity (>0.75)	19	67	0.48	22	91	<0.001
Low continuity (<=0.75)	20	74		22	99
Minimum doctor visits	18	70		18	63
Community Size and Metropolitan Influence Zone
Urban	17	69	<0.001	21	93	0.01
Rural	26	72	<0.001	20	88	0.01

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