Table III.

Effect of Patient Characteristics on Willingness-to-pay

Characteristic	n	Median*	p*
Gender
Male	42	200	0.983
Female	56	200
Prep type
NuLytely (0)	88	200	0.467
Fleets (1)	10	237.5
First colonoscopy
Yes	58	200	0.447
No	36	225
Reason
Screening colonoscopy	95	200	0.759
Polyp surveillance	2	300
Family history (1st degree relative)
Yes	11	200	0.631
No	82	200
Feel completely back to normal 1 wk after colonoscopy
Yes	93	200	0.385
No	4	275
Missed paid work
Yes	42	225	0.454
No	54	150
Missed household chores
Yes	46	250	0.032
No	50	175
Missed caring for others
Yes	28	175	0.262
No	68	200
Missed leisure activities
Yes	45	250	0.049
No	51	150
Missed other activities
Yes	14	237.5	0.364
No	83	200
“Bad effects” from colonoscopy:
Yes	16	250	0.103
No	79	200
History of cancer, any type	30	200	0.957
No history of cancer	68	200
Colonoscopy experience
Moderately or very easy	55	150	0.007
Neither easy nor difficult	17	200
Moderately or very difficult	22	250
Work days missed
Zero	16	100	0.214
Part of a day	8	250
One	22	250
Two	8	212.5
Three or more	1	20
Not applicable	40	200
Preparation for colonoscopy (3 cat)
Moderately or very easy	31	100	<0.001
Neither easy nor difficult	19	100
Moderately or very difficult	46	250
Mode of transportation
Personal/family car	78	200	0.065
Friend’s car	16	100
Taxi	0
Bus	0
Other	4	275
Who accompanied patient
Spouse or significant other	62	200	0.151
Relative	13	250
Friend	19	150
Other	4	75
Roundtrip distance
Less than 5 miles	13	300	0.436
5 to 9.9 miles	20	225
10 to 19.9 miles	27	200
20 to 29.9 miles	15	100
30 to 49.9 miles	11	250
50 or more miles	12	237.5
Recovery from colonoscopy
Very easy	56	212.5	0.619
Moderately easy	26	175
Neither easy nor difficult	5	150
Moderately difficult	6	100
Very difficult	1	150
Risk of colon cancer compared to others your age (self reported)
Lower	37	100	0.090
Average	51	200
Higher	10	275
How effective do you think colonoscopy is…?
Completely ineffective
Not very effective	2	150	0.375
Moderately effective	0
Very effective	24	150
	72	212.5
General Health
Excellent	27	250	0.072
Very good	44	200
Good	19	150
Fair	6	99.5
Poor	2	137.69
Race
White	86	225	0.011
Black/African American	9	100
Hispanic	1	75
Asian/Pacific Islander	1	100
Other	0
Education
7th grade or lower	0		0.033
8th through 11th grade	1	200
High school graduate or GED	6	50
Some college or vocational sch.	13	150
2-year college	6	100
4-year college	22	237.5
Professional or graduate degree	50	225
Insured	90	200	0.050
Not insured	7	100
Medicare
Yes	39	150	0.089
No	58	225
Medicaid
Yes	2	175	0.321
No	94	200
Number of people in household:
One	17	150	0.107
Two	59	200
Three	14	200
Four	5	225
Five	3	500
Six	0
Seven or more	0
Annual Household Income
0 to $14,999	9	100	0.005
$15,000 to $29,999	6	125
$30,000 to $44,999	8	100
$45,000 to $59,999	12	100
$60,000 to $74,999	10	150
$75,000 to $89,999	10	212.5
$90,000 or greater	33	250
Did not wish to answer	10	325
Current employment status:
Employed	46	250	0.095
Unemployed	1	500
Housewife/husband	4	250
Retired	40	150
Disabled	7	100

^*Medians and p values calculated using wilcoxon rank-sum for variables with two categories and using Kruskal-Wallis for variables with more than two categories.