Establishment of Reference Norms for Lung Function Parameters of Healthy Sri Lankan Tamils

Table 7

Reference equations for lung function parameters based on age & arm span.

Parameter	Males			Females
	Equation	SEE	Adj.	Equation	SEE	Adj.
<20 years
VC (L)	0.040AS + 0.091age − 5.105	0.463	0.554	0.031AS + 0.009age − 2.545	0.341	0.269
FVC (L)	0.042AS + 0.109age − 5.719	0.465	0.599	0.033AS + 0.013age − 2.971	0.345	0.305
FEV1 (L)	0.032AS + 0.101age − 4.260	0.427	0.536	0.028AS + 0.01age − 2.266	0.309	0.275
PEFR (L/min)	3.009AS + 15.84 age − 379.033	59.68	442	2.199AS + 0.888age − 55.094	46.83	0.090
>20 years
VC (L)	0.036AS + 0.022age − 2.16	0.468	0.456	0.028AS + 0.017age − 1.632	0.361	0.412
FVC (L)	0.035AS + 0.025age − 2.971	0.470	0.479	0.028AS + 0.019age − 1.421	0.358	0.453
FEV1 (L)	0.027AS + 0.023age − 0.943	0.400	0.481	0.022AS + 0.019age − 0.738	0.301	0.483
PEFR (L/min)	3.393AS + 1.327age − 90.520	71.22	0.191	1.991AS + 1.381age + 47.031	47.18	0.191

AS-arm span (cm).