Table 2. The summarization of Modified King’s criteria (109).

Criteria	Stage 0	Stage 1	Stage 2	Stage 3
Airway sleep	Normal	Snoring	Apnea require CPAP	Cor pulmonale
BMI (kg/m2)	<30	30–35	35–50	>50
Cardiovascular	<25% risk	>25% risk	Heart disease	Heart failure
Diabetes	Normal	Impaired fasting glycemia	Type 2 diabetes	Uncontrolled type 2 diabetes
Economic	Normal	Suffered discrimination	Unemployed due to obesity	Requires financial support
Functional	Can manage 3 flights of stairs	Manage 1 or 2 flights of stairs	Manage <1 flight of stairs or requires walking aids	Housebound
Gonadal	Normal	Irregular periods	PCOS/impotence	Infertility
Health status	Normal	Low mood or QoL	Moderate depression or poor QoL	Severe depression
Image	Normal	Does not like looking in mirror	Avoid mirrors/body image dysphoria	Severe eating disorder
Junction gastroesophageal	Normal	Heartburn	Esophagitis	Barrett esophagus
Kidney	Normal	Proteinuria	GFR <60 mL/min	GFR <30 mL/min
Liver	Normal	Raised LFT/NAFLD	NASH	Liver failure

CPAP, continuous positive airway pressure; BMI, body mass index; PCOS, polycystic ovary syndrome; QoL, quality of life; GFR, glomerular filtration rate; LFT, liver function test; NAFLD, non-alcoholic fatty liver disease; NASH, non-alcoholic steatohepatitis.