Prediction equations for diffusing capacity (transfer factor) of lung for North Indians
Background: Prediction equations for diffusing capacity of lung for carbon monoxide (DLCO), alveolar volume (VA), and DLCO/VA using the current standardization guidelines are not available for Indian population. The present study was carried out to develop equations for these parameters for North In...
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| Format: | Article |
| Language: | English |
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Wolters Kluwer Medknow Publications
2016-01-01
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| Series: | Lung India |
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| Online Access: | http://www.lungindia.com/article.asp?issn=0970-2113;year=2016;volume=33;issue=5;spage=479;epage=486;aulast=Chhabra |
| _version_ | 1818422036816461824 |
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| author | Sunil Kumar Chhabra Rajeev Kumar Uday A Gupta |
| author_facet | Sunil Kumar Chhabra Rajeev Kumar Uday A Gupta |
| author_sort | Sunil Kumar Chhabra |
| collection | DOAJ |
| description | Background: Prediction equations for diffusing capacity of lung for carbon monoxide (DLCO), alveolar volume (VA), and DLCO/VA using the current standardization guidelines are not available for Indian population. The present study was carried out to develop equations for these parameters for North Indian adults and examine the ethnic diversity in predictions. Materials and Methods: DLCO was measured by single-breath technique and VA by single-breath helium dilution using standardized methodology in 357 (258 males, 99 females) normal nonsmoker adult North Indians and DLCO/VA was computed. The subjects were randomized into training and test datasets for development of prediction equations by multiple linear regressions and for validation, respectively. Results: For males, the following equations were developed: DLCO, −7.813 + 0.318 × ht −0.624 × age + 0.00552 × age 2 ; VA, −8.152 + 0.087 × ht −0.019 × wt; DLCO/VA, 7.315 − 0.037 × age. For females, the equations were: DLCO, −44.15 + 0.449 × ht −0.099 × age; VA, −6.893 + 0.068 × ht. A statistically acceptable prediction equation was not obtained for DLCO/VA in females. It was therefore computed from predicted DLCO and predicted VA. All equations were internally valid. Predictions of DLCO by Indian equations were lower than most Caucasian predictions in both males and females and greater than the Chinese predictions for males. Conclusion: This study has developed validated prediction equations for DLCO, VA, and DLCO/VA in North Indians. Substantial ethnic diversity exists in predictions for DLCO and VA with Caucasian equations generally yielding higher values than the Indian or Chinese equations. However, DLCO/VA predicted by the Indian equations is slightly higher than that by other equations. |
| first_indexed | 2024-12-14T13:19:52Z |
| format | Article |
| id | doaj.art-27a2c1240ea84f25ac2dfd41bf33eeb2 |
| institution | Directory Open Access Journal |
| issn | 0970-2113 0974-598X |
| language | English |
| last_indexed | 2024-12-14T13:19:52Z |
| publishDate | 2016-01-01 |
| publisher | Wolters Kluwer Medknow Publications |
| record_format | Article |
| series | Lung India |
| spelling | doaj.art-27a2c1240ea84f25ac2dfd41bf33eeb22022-12-21T22:59:57ZengWolters Kluwer Medknow PublicationsLung India0970-21130974-598X2016-01-0133547948610.4103/0970-2113.188960Prediction equations for diffusing capacity (transfer factor) of lung for North IndiansSunil Kumar ChhabraRajeev KumarUday A GuptaBackground: Prediction equations for diffusing capacity of lung for carbon monoxide (DLCO), alveolar volume (VA), and DLCO/VA using the current standardization guidelines are not available for Indian population. The present study was carried out to develop equations for these parameters for North Indian adults and examine the ethnic diversity in predictions. Materials and Methods: DLCO was measured by single-breath technique and VA by single-breath helium dilution using standardized methodology in 357 (258 males, 99 females) normal nonsmoker adult North Indians and DLCO/VA was computed. The subjects were randomized into training and test datasets for development of prediction equations by multiple linear regressions and for validation, respectively. Results: For males, the following equations were developed: DLCO, −7.813 + 0.318 × ht −0.624 × age + 0.00552 × age 2 ; VA, −8.152 + 0.087 × ht −0.019 × wt; DLCO/VA, 7.315 − 0.037 × age. For females, the equations were: DLCO, −44.15 + 0.449 × ht −0.099 × age; VA, −6.893 + 0.068 × ht. A statistically acceptable prediction equation was not obtained for DLCO/VA in females. It was therefore computed from predicted DLCO and predicted VA. All equations were internally valid. Predictions of DLCO by Indian equations were lower than most Caucasian predictions in both males and females and greater than the Chinese predictions for males. Conclusion: This study has developed validated prediction equations for DLCO, VA, and DLCO/VA in North Indians. Substantial ethnic diversity exists in predictions for DLCO and VA with Caucasian equations generally yielding higher values than the Indian or Chinese equations. However, DLCO/VA predicted by the Indian equations is slightly higher than that by other equations.http://www.lungindia.com/article.asp?issn=0970-2113;year=2016;volume=33;issue=5;spage=479;epage=486;aulast=ChhabraDiffusing capacitylung function testsprediction equationstransfer factor |
| spellingShingle | Sunil Kumar Chhabra Rajeev Kumar Uday A Gupta Prediction equations for diffusing capacity (transfer factor) of lung for North Indians Lung India Diffusing capacity lung function tests prediction equations transfer factor |
| title | Prediction equations for diffusing capacity (transfer factor) of lung for North Indians |
| title_full | Prediction equations for diffusing capacity (transfer factor) of lung for North Indians |
| title_fullStr | Prediction equations for diffusing capacity (transfer factor) of lung for North Indians |
| title_full_unstemmed | Prediction equations for diffusing capacity (transfer factor) of lung for North Indians |
| title_short | Prediction equations for diffusing capacity (transfer factor) of lung for North Indians |
| title_sort | prediction equations for diffusing capacity transfer factor of lung for north indians |
| topic | Diffusing capacity lung function tests prediction equations transfer factor |
| url | http://www.lungindia.com/article.asp?issn=0970-2113;year=2016;volume=33;issue=5;spage=479;epage=486;aulast=Chhabra |
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