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Physical Features Observation: Is it Repeatable in Zygosity Determination of Chinese Adult Twins?

Published online by Cambridge University Press:  21 February 2012

Wenjing Gao
Affiliation:
Department of Epidemiology and Biostatistics, School of Public Health, Peking University Health Science Center, Beijing, China.
Liming Li*
Affiliation:
Department of Epidemiology and Biostatistics, School of Public Health, Peking University Health Science Center, Beijing, China. lmlee@pumc.edu.cn
Weihua Cao
Affiliation:
Department of Epidemiology and Biostatistics, School of Public Health, Peking University Health Science Center, Beijing, China.
Siyan Zhan
Affiliation:
Department of Epidemiology and Biostatistics, School of Public Health, Peking University Health Science Center, Beijing, China.
Yunlong Zhao
Affiliation:
Department of Epidemiology and Biostatistics, School of Public Health, Peking University Health Science Center, Beijing, China.
Hui Wang
Affiliation:
Department of Epidemiology and Biostatistics, School of Public Health, Peking University Health Science Center, Beijing, China.
Yonghua Hu
Affiliation:
Department of Epidemiology and Biostatistics, School of Public Health, Peking University Health Science Center, Beijing, China.
*
*Address for correspondence: Liming Li, Department of Epidemiology and Biostatistics, School of Public Health, Peking University Health Science Center, 38 Xueyuan Road, Haidian District, Beijing 100191, China.

Abstract

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This study reports on the inter- and intrarater reliability of physical features observation. Study subjects were 176 Chinese adult persons, consisting of 89 males and 87 females. Three trained research assistants responded simultaneously and respectively to 12 items regarding the subject's physical features including ‘hair’, ‘Mongoloid folds’, left and right ‘ear lobes’, ‘earwax’, ‘nostril shape’, ‘tongue rolling’, left and right ‘hitchhiker's thumb’, ‘mid-digital hair’ and left and right ‘simian crease’ at the moment of interview. And 14 days later, these subjects received the same observation once again. The results showed that the inter- and intra-observer agreements of ‘hair’, ‘earwax’, ‘tongue rolling’, ‘mid-digital hair’ and ‘simian crease’ were almost perfect with most kappa (κ) coefficients ≥ .80, while ‘Mongoloid fold’ and ‘nostril shape’ showed poor inter-observer agreement and ‘nostril shape’ showed poor intra-observer agreement (κ < .40). Two other physical features, ‘hitchhiker's thumb’ and ‘ear lobes’ showed moderate inter-observer agreement and three features, ‘hitchhiker's thumb’, ‘ear lobes’ and ‘Mongoloid fold’, showed moderate intra-observer agreement (.40≤ κ <.80). In conclusion, this study suggests that as far as reliability is concerned, the five features which were ‘hair’, ‘earwax’, ‘tongue rolling’, ‘mid-digital hair’ and ‘simian crease’ could be considered in zygosity determination of Chinese adult twins, while the two features, ‘Mongoloid fold’ and ‘nostril shape’, should be abandoned.

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Copyright © Cambridge University Press 2010
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