A Novel Fuzzy Logic-Based Medical Expert System for Diagnosis of Chronic Kidney Disease

Table 2

Variables in FES.

Input variables	Linguistic label	Membership function	Interval
Nephron functionality	Very-risky	Trapezoidal	(−1, 0.1, 0.28, 0.35)
	Moderately risky	Trapezoidal	(0.3, 0.37, 0.42, 0.5)
	Safe-zone	Trapezoidal	(0.47, 0.53, 0.54, 1)
Blood sugar	Safe	Trapezoidal	(−58, 4, 65, 104)
	Borderline	Trapezoidal	(104, 120, 125, 150)
	High	Trapezoidal	(140, 162, 362, 458)
Diastolic blood pressure	Low	Trapezoidal	(65, 78.33, 82, 89)
	Medium	Trapezoidal	(87, 95, 100, 110)
	High	Trapezoidal	(106, 110, 115, 121)
	Extremely high	Trapezoidal	(118, 123, 131.7, 144.9)
Systolic blood pressure	Low	Trapezoidal	(29.6, 74.4, 118, 134)
	Medium	Trapezoidal	(127, 137, 143, 153)
	High	Trapezoidal	(142, 157, 162, 172)
	Extremely high	Trapezoidal	(162, 180, 240, 250)
Age	Young	Trapezoidal	(−18.8, 6.8, 28, 36)
	Mid-age	Trapezoidal	(33, 44, 55, 66)
	Old	Trapezoidal	(52, 61, 93.2, 118.8)
BMI	Underweight	Trapezoidal	(−46.66, 1, 14.18, 19)
	Normal weight	Trapezoidal	(18.5, 20, 22.5, 24.9)
	Overweight	Trapezoidal	(24.6, 25.1, 28.1, 30)
	Obese	Trapezoidal	(29.5, 30, 41, 55)
Smoke	Low	Trapezoidal	(−7.25, −0.85, 1.5, 2.64)
	Medium	Trapezoidal	(1.8, 5.2, 5.8, 9.5)
	High	Trapezoidal	(8.5, 11, 20.8, 27.2)
Output variable
Result	Healthy	Trapezoidal	(−3.57, −0.34, 1.1, 1.7)
	Concerning	Triangular	(1.5, 2.4, 3.26)
	Very-concerning	Triangular	(2.84, 3.67, 4.5)
	Sick	Triangular	(4, 5, 6)
	Very sick	Triangular	(5.5, 6.74, 7.98)
	Extremely sick	Trapezoidal	(7.5, 8.4, 300)