Supplemental Methods
Definition and categorization of insurance type: According to the coding in the SEER database, insurance type was recorded at the time of initial diagnosis or treatment of the condition. Changes in insurance status are not recorded in the SEER database and information on whether the insurance type was recorded at diagnosis or initial treatment is not available.
Patients with Medicaid, Medicaid Health Maintenance Organization (HMO), or Indian Health Services insurance were coded as “Medicaid”. Patients with private insurance, Medicare, any combination of Medicare plus supplemental insurance, or Veterans Affairs or military
insurance were coded as “other insurance.” Patients without insurance or who were “self-pay”
were coded as “no insurance”. Patients who were coded as “insured-no specifics” were
included in the “other insurance” category. Because the majority of patients age 65 and over
will be eligible for Medicare and therefore the rate of uninsured patients of the over age 65 is
extremely small, the analysis was restricted to ages 15-64.
Supplemental Table 1. Age adjusted and age specific colon cancer survival by age and insurance type.
Insurance type
Age Time
(years)
All Medicaid None Other Diff1* Diff2*
All (age adjusted )
1 87.3
(87.0-87.6)
78.0 (77.0-78.9)
79.0 (77.7-80.4)
89.9 (89.6-90.2)
+11.9 +10.9
2 78.5
(78.1-78.8)
65.7 (64.5-66.9)
67.9 (66.3-69.5)
81.8 (81.4-82.2)
+16.1 +13.9
3 72.0
(71.6-72.4)
57.0 (55.6-58.3)
61.2 (59.4-63.0)
75.6 (75.1-76.0)
+18.6 +14.4
15-44 1 90.0
(89.3-90.8)
82.6 (80.3-84.9)
84.7 (81.787.7)
92.3 (91.5-93.0)
+9.7 +7.6
2 80.8
(79.8-81.8)
68.5 (65.5-71.5)
76.1 (72.3-79.9)
83.8 (82.7-84.9)
+15.3 +7.7
3 73.4
(72.2-74.7)
58.7 (55.2-62.2)
65.6 (60.9-70.2)
77.4 (76.0-78.7)
+18.7 +11.8
45-54 1 89.1
(88.7-89.6)
80.1 (78.5-81.7)
81.1 (79.0-83.3)
91.6 (91.2-92.1)
+11.5 +10.5
2 80.3
(79.7-80.9)
67.3 (65.2-69.3)
69.0 (66.2-71.7)
83.8 (83.1-84.4)
+16.5 +14.8
3 74.1
(73.4-74.8)
58.4 (56.1-60.8)
61.9 (58.8-65.0)
77.9 (77.1-78.7)
+19.5 +16.0
55-64 1 85.5
(85.1-85.9)
75.5 (74.1-76.9)
76.3 (74.4-78.2)
88.3 (87.9-88.7)
+12.8 +12.0
2 76.8
(76.3-77.3)
64.0 (62.3-65.6)
65.0 (62.7-67.2)
80.1 (79.6-80.7)
+16.1 +15.1
3 70.5
(69.9-71.0)
55.7 (53.9-57.6)
59.5 (57.1-62.0)
73.8 (73.1-74.4)
+18.1 +14.3 Diff1=difference between Medicaid and other insurance
Diff2=difference between uninsured and other insurance
*p<=0.0001 for all comparisons
Supplemental Table 2. Age adjusted colon cancer survival by insurance type and stage.
Insurance type Stage Time
(years)
All Medicaid None Other Diff1* Diff2*
I 1 97.1
(96.8-97.4)
92.7 (91.0-94.3)
94.7 (92.7-96.8)
97.7 (97.4-98.0)
+5.0 +3.0
2 95.6
(95.2-96.0)
88.6 (86.4-90.7)
92.0 (89.3-94.6)
96.5 (96.1-96.9)
+7.9 +4.5
3 93.7
(93.2-94.2)
84.0 (81.2-86.8)
89.1 (85.8-92.4)
95.0 (94.5-95.5)
+11.0 +5.9
II 1 96.4
(96.0-96.7)
93.1 (91.8-94.4)
94.8 (93.4-96.3)
97.1 (96.8-97.5)
+4.0 +2.3
2 93.2
(92.7-93.7)
87.5 (85.7-89.3)
89.7 (87.5-91.8)
94.6 (94.1-95.1)
+7.1 +4.9
3 89.8
(89.1-90.4)
81.2 (78.9-83.6)
85.9 (83.3-88.6)
91.6 (91.0-92.3)
+10.4 +5.7
III 1 93.9
(93.4-94.3)
88.4 (86.8-89.9)
89.3 (87.3-91.3)
95.2 (94.8-95.6)
+7.8 +5.9
2 86.5
(85.9-87.1)
78.1 (75.9-80.2)
78.3 (75.5-81.1)
88.6 (88.0-89.3)
+10.5 +10.3
3 79.6
(78.8-80.4)
68.7 (66.1-71.3)
70.2 (66.8-73.5)
82.2 (81.3-83.0)
+13.5 +12.0
IV 1 63.2
(62.3-64.0)
52.8 (50.8-54.9)
50.4 (47.6-53.3)
67.8 (66.9-68.8)
+15.0 +17.4
2 40.2
(39.2-41.1)
30.8 (28.7-32.8)
30.0 (27.2-32.9)
44.2 (43.1-45.3)
+13.4 +14.2
3 26.4
(25.5-27.3)
19.7 (17.7-21.7)
19.9 (17.1-22.7)
29.2 (28.1-30.4)
+9.5 +9.3
Diff1=difference between Medicaid and other insurance
Supplemental Table 3. Age adjusted and age specific 1, 2, and 3-year survival by insurance type for men.
Insurance type
Age Time
(years)
All Medicaid None Other Diff1* Diff2*
All 1 88.9
(88.5-89.2)
80.4 (79.1-81.8)
82.2 (80.5-83.8)
91.1 (90.7-91.5)
+10.7 +8.9
2 81.8
(81.3-82.3)
70.6 (69.0-72.3)
73.5 (71.4-75.6)
84.5 (84.0-85.0)
+13.9 +11.0
3 76.8
(76.3-77.4)
64.0 (62.1-65.9)
68.9 (66.6-71.2)
79.6 (79.0-80.2)
+15.6 +10.7
15-44 1 90.7
(89.7-91.7)
82.5 (79.1-85.9)
85.0 (81.1-89.0)
93.0 (92.0-94.1)
+10.5 +8.0
2 83.5
(82.1-84.8)
69.4 (64.9-73.9)
78.6 (73.8-83.4)
86.7 (85.2-88.2)
+17.3 +8.1
3 78.5
(76.9-80.1)
61.4 (56.1-66.6)
74.5 (69.1-79.9)
82.2 (80.5-84.0)
+20.8 +7.7
45-54 1 90.2
(89.6-90.8)
83.1 (80.9-85.3)
82.4 (79.6-85.2)
92.5 (91.9-93.1)
+9.4 +10.1
2 83.0
(82.2-83.8)
73.4 (70.6-76.1)
72.7 (69.2-76.2)
85.8 (84.9-86.7)
+12.4 +13.1
3 78.2
(77.3-79.2)
67.1 (63.9-70.2)
66.9 (62.9-70.9)
81.1 (80.1-82.2)
+14.0 +14.2
55-64 1 87.6
(87.1-88.1)
78.4 (76.5-80.4)
81.2 (78.8-83.6)
89.7 (89.2-90.3)
+11.3 +8.5
2 80.7
(80.0-81.3)
69.5 (67.2-71.8)
72.4 (69.5-75.3)
83.1 (82.4-83.8)
+13.6 +10.7
3 75.6
(74.9-76.4)
63.2 (60.6-65.7)
68.3 (65.1-71.6)
80.4 (79.1-81.8)
+17.2 +12.1 Diff1=difference between Medicaid and other insurance
Diff2=difference between uninsured and other insurance
*p<=0.0001 for all comparisons
Supplemental Table 4. Age adjusted and age specific 1, 2, and 3-year survival by insurance type for women.
Insurance type
Age Time
(years)
All Medicaid None Other Diff1 Diff2
All 1 90.1
(89.7-90.4)
83.1 (81.8-84.3)
83.8 (82.0-85.6)
92.1 (91.7-9.5)
+9.0** +8.3**
2 83.1
(82.6-83.6)
73.3 (71.8-74.9)
74.6 (72.3-76.8)
85.6 (85.1-86.2)
+12.3** +11.0*
*
3 78.1
(77.5-78.7)
66.6 (64.8-68.4)
70.5 (68.0-72.9)
80.9 (80.3-81.6)
+14.3** +10.4*
*
15-44 1 92.6
(91.7-93.5)
87.4 (84.7-90.1)
89.2 (85.3-93.1)
94.1 (93.2-95.1)
+6.7** +4.9*
2 85.4
(84.1-86.7)
77.7 (74.1-81.3)
83.6 (78.7-88.6)
87.2 (85.7-88.6)
+9.5*** +3.6
3 79.6
(78.0-81.2)
71.2 (66.9-75.5)
73.6 (66.9-80.3)
82.2 (80.4-83.9)
+11.0**
*
+8.4**
45-54 1 91.5
(90.9-92.1)
84.1 (82.0-86.3)
86.6 (83.7-89.5)
93.3 (92.7-93.9)
+9.2** +6.7**
2 84.7
(83.8-85.5)
72.9 (70.1-75.7)
75.8 (71.9-79.7)
87.5 (86.6-88.3)
+12.6** +11.7*
*
3 80.5
(79.5-81.4)
67.1 (63.9-70.2)
73.4 (69.3-77.6)
83.4 (82.4-84.5)
+16.3** +10.0*
*
55-64 1 88.6
(88.0-89.1)
81.2 (79.4-83.1)
80.8 (78.1-83.4)
90.8 (90.3-91.4)
+9.6** +10.0*
*
2 81.5
(80.8-82.2)
72.3 (70.1-74.5)
71.3 (68.1-74.5)
84.2 (83.5-85.0)
+11.9** +12.9*
*
3 76.5
(75.6-77.3)
65.0 (62.5-67.6)
68.0 (64.5-71.4)
79.3 (78.4-80.2)
+14.3** +11.3*
* Diff1=difference between Medicaid and other insurance
Diff2=difference between uninsured and other insurance
