Research Article
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 |
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