CHOKAI is derived from capsule, hydronephrosis, occult, kidney stone, adult, age and diminution of pain.
Patient selection: renal colic, age >= 15 years
Parameters:
(1) distention of the renal capsule (with nausea or vomiting)
(2) hydronephrosis
(3) occult blood in urine (microscopic)
(4) kidney stone history
(5) adult and sex
(6) age in years
(7) diminution of pain within 6 hours
|
Parameter
|
Finding
|
Points
|
|
nausea and vomiting (distention of the renal capsule)
|
no
|
0
|
|
|
yes
|
1
|
|
hydronephrosis
|
no
|
0
|
|
|
yes
|
4
|
|
occult blood in urine
|
no
|
0
|
|
|
yes
|
3
|
|
history of kidney stones
|
no
|
0
|
|
|
yes
|
1
|
|
sex
|
female
|
0
|
|
|
male
|
1
|
|
age in years
|
< 60 years
|
1
|
|
|
>= 60
|
0
|
|
diminution of pain within 6 hours
|
no
|
0
|
|
|
yes
|
2
|
total score =
= SUM(points for all 7 parameters)
Interpretation:
• minimum score: 0
• maximum score: 13
• The optimum cutoff for prediction of a ureteral stone was >= 6.
Performance:
• The area under the ROC curve is reported as 0.97.
• 8 of 96 patients in the initial study were misclassified (7 with stones had score <= 5; 1 without stone had a score >-6).
