The Widespread Pain Index (WPI) is a clinical calculator used in the diagnosis of fibromyalgia, a chronic condition characterized by widespread pain, fatigue, and cognitive difficulties. The WPI is part of the American College of Rheumatology's (ACR) 2010 diagnostic criteria for fibromyalgia. 

The WPI applies to patients who present with chronic, widespread pain. It quantifies the number of body regions out of 19 possible areas where the patient has experienced pain in the last week. The score ranges from 0 to 19, with higher scores indicating more widespread pain.

The clinical utility of the WPI is to aid in the diagnosis of fibromyalgia, particularly in conjunction with the Symptom Severity Score (SSS). Together, these scores can help clinicians differentiate fibromyalgia from other conditions with similar symptoms.

Exclusion criteria for the use of the WPI include the presence of a disorder that would otherwise explain the pain, such as rheumatoid arthritis or lupus. It is also not applicable in acute pain situations or for localized pain conditions.

Widespread pain index (WPI)

# Description:
The Widespread Pain Index (WPI) is a clinical calculator used in the diagnosis of fibromyalgia, a chronic condition characterized by widespread pain, fatigue, and cognitive difficulties. The WPI is part of the American College of Rheumatology's (ACR) 2010 diagnostic criteria for fibromyalgia. 

The WPI applies to patients who present with chronic, widespread pain. It quantifies the number of body regions out of 19 possible areas where the patient has experienced pain in the last week. The score ranges from 0 to 19, with higher scores indicating more widespread pain.

The clinical utility of the WPI is to aid in the diagnosis of fibromyalgia, particularly in conjunction with the Symptom Severity Score (SSS). Together, these scores can help clinicians differentiate fibromyalgia from other conditions with similar symptoms.

Exclusion criteria for the use of the WPI include the presence of a disorder that would otherwise explain the pain, such as rheumatoid arthritis or lupus. It is also not applicable in acute pain situations or for localized pain conditions.
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# Inputs:
# Areas in which the patient had pain over the past week
A. Shoulder girdle, left (+1)
B. Shoulder girdle, right (+1)
C. Upper arm, left (+1)
D. Upper arm, right (+1)
E. Lower arm, left (+1)
F. Lower arm, right (+1)
G. Hip (buttock, trochanter), left (+1)
H. Hip (buttock, trochanter), right (+1)
I. Upper leg, left (+1)
J. Upper leg, right (+1)
K. Lower leg, left (+1)
L. Lower leg, right (+1)
M. Jaw, left (+1)
N. Jaw, right (+1)
O. Chest (+1)
P. Abdomen (+1)
Q. Upper back (+1)
R. Lower back (+1)
S. Neck (+1)
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# Scoring:
- If score == 1, then WPI score is 1
- If score == 2, then WPI score is 2
- If score == 3, then WPI score is 3
- If score == 4, then WPI score is 4
- If score == 5, then WPI score is 5
- If score == 6, then WPI score is 6
- If score == 7, then WPI score is 7
- If score == 8, then WPI score is 8
- If score == 9, then WPI score is 9
- If score == 10, then WPI score is 10
- If score == 11, then WPI score is 11
- If score == 12, then WPI score is 12
- If score == 13, then WPI score is 13
- If score == 14, then WPI score is 14
- If score == 15, then WPI score is 15
- If score == 16, then WPI score is 16
- If score == 17, then WPI score is 17
- If score == 18, then WPI score is 18
- If score == 19, then WPI score is 19
- If score == 0, then Please make a selection)