TABLE 2.

Associations Between Age, Injection Site, or Previous Interventions or Surgery and Time to Visualization of First Node

Variable	Time to first node (min)										Total	Statistics
Variable	10	15	20	25	30	35	40	45	60	180	Total	Statistics
Age (y)												$\text{[math]}$ = 35.2, P = 0.508
35–44	5	0	0	1	0	0	0	0	0	0	6
45–54	24	5	0	0	2	0	0	0	0	0	31
55–64	28	2	2	1	0	1	1	0	0	0	35
65–74	29	10	0	1	1	0	0	1	0	1	43
75+	20	4	1	0	0	1	1	0	1	1	29
Total	106	21	3	3	3	2	2	1	1	2	144
Injection site												$\text{[math]}$ = 67.6, P = 0.001
Lower inner	10	3	1	0	0	0	0	0	0	0	14
Lower outer	22	3	0	1	1	0	1	0	0	0	28
Upper inner	28	3	1	0	1	1	1	0	0	2	37
Upper outer	46	12	1	2	0	1	0	1	1	0	64
Retroareolar	0	0	0	0	1	0	0	0	0	0	1
Total	106	21	3	3	3	2	2	1	1	2	144
Previous intervention or surgery												$\text{[math]}$ = 35.2, P = 0.966
Biopsy	94	16	2	3	3	1	2	1	1	2	125
Mastectomy	1	0	0	0	0	0	0	0	0	0	1
None	1	2	0	0	0	0	0	0	0	0	3
WLE	4	3	1	0	0	0	0	0	0	0	8
Total	100	21	3	3	3	1	2	1	1	2	137