Correlation of Body Mass Index and Oxygen Saturation in Chronic Obstructive Pulmonary Disease Patients at a Tertiary Care Center in Nepal: A Cross-Sectional Study

Figures & data

Table 1 BMI Classification for Asians

BMI Category	BMI (kg/m^2)
Underweight	<18.5
Normal	18.5–22.9
Overweight	23–24.9
Obese	≥25

Abbreviation: BMI, body mass index.

Table 2 GOLD Criteria for Severity of Airflow Obstruction in COPD

COPD Severity	Characteristics
	FEV1/FVC	FEV1
Grade 1 (Mild)	<70%	≥80% of predicted
Grade 2 (Moderate)	<70%	≥50% to <80% of predicted
Grade 3 (Severe)	<70%	≥30% to <50% of predicted
Grade 4 (Very Severe)	<70%	<30% of predicted

Note: © 2022, 2023, Global Initiative for Chronic Obstructive Lung Disease, available from www.goldcopd.org, published in Deer Park, IL, USA.

Abbreviations: COPD, chronic obstructive pulmonary disease; GOLD, Global Initiative for Chronic Obstructive Lung Disease; FEV₁, forced expiratory volume in 1 second; FVC, forced vital capacity.

Table 3 Correlation of COPD Grades and Mean Oxygen Saturation

COPD Grades	Mean SpO2 (%)	N	Standard Deviation (%)
Grade 1 (FEV1 ≥80%)	95.85	20	1.18
Grade 2 (FEV1 50–79%)	92.32	44	1.84
Grade 3 (FEV1 30–49%)	88.17	47	1.48
Grade 4 (FEV1 ≤29%)	84.50	34	1.66
Total	89.63	145	4.13
df=3, p<0.01

Abbreviations: COPD, chronic obstructive pulmonary disease; SpO₂, oxygen saturation; df, degrees of freedom; N, number.

Table 4 Comparison Between COPD Grades and Mean BMI (kg/m²)

COPD Grades	Mean BMI	N	Standard Deviation	Minimum	Maximum
Grade 1 (FEV1 ≥80%)	24.50	20	3.82	16.43	34.13
Grade 2 (FEV1 50–79%)	21.69	44	2.84	16.38	26.43
Grade 3 (FEV1 30–49%)	19.33	47	2.76	15.22	25.34
Grade 4 (FEV1 ≤29%)	17.90	34	1.86	15.61	24.65
Total	20.42	145	3.50	15.22	34.13
df=3, p<0.01

Abbreviations: COPD, chronic obstructive pulmonary disease; BMI, body mass index; FEV₁, forced expiratory volume in 1 second; df, degrees of freedom; N, number.